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Old 08-10-2007, 07:24 PM   #1
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Default Viper T-56 Conversion "Write UP" Inside

This is for those out there that “do it themselves”, and it should save you some money.

Venders ( Call these companies to order your parts. I all ready have figured out which is the cheapest. Order the following parts from each company, part numbers are in parentheses().. )
Parts List
1. Blumenthals (405)-232-9557
A. Viper Output Seal (16725) $7.41
B. Viper Tail Housing Bushing (BM29) $10.00
C. Main Shaft Bearing, front ( SET16) $12.39
D. Viper Speedo reluctor 10T (1386-110-003) 8.73
E. 30 Spline Spicer Yoke (short yoke/ 3-3-3931X) 61.28
F. U-Joint Viper to F-body Driveshaft (2-1153) 22.43


2. Six Speeds Inc (713)937-4411
A. Viper 30 Spline Main Shaft 225.00


3. D&D Performance (248)-735-6220
A. Viper Snap ring Kit 15.00


4. GM Dealership
A. GM Trany Silicone (97720043) 25.00


Parts Total = $387.24
Click the image to open in full size.



Now for the Machine work. I had a hard time finding a place that had the machines to do the work.
I paid $140.00 for the machine work.
90.00 to cut down main shaft
60.00 bore out bushing
30.00 bore out seal

Refer to the pictures for help.

Machine Work
1. Remove tail housing from t-56
2. Take seal and bushing out of the old tail housing.
Click the image to open in full size.
(Seal already out, stock bushing still in)
Click the image to open in full size.
(Seal and bushing out, Notice the valley in the housing)

3. Notice the seal , and the stock “shorter” bushing.
Click the image to open in full size.
The Machine shop will have to bore the tail housing out for the larger Viper bushing and , Viper seal. Also notice the small hole in the bushing, the viper bushing hole must line up the same. Other wise you won’t be able to add trany fluid when you are done.
Click the image to open in full size.


4. Take the tail housing to the machine shop and have it machined to the following specs.
Seal machine for a .003” press fit
Bushing machine for a .003-.004” press fit ( .005” is kind of tight to press in, I recommend a little less)
Have the viper main shaft machined down 1.5” , or the same length as the stock shaft.( I did ĺ” but 1.5” would be better), Note- You can cut the shaft with a chop saw , BUT if the threads are buggered it will be hard to slip on the new speedo reluctor gear. It may not slip on at all. I recommend Machining it, but a chop saw is cheaper.
Click the image to open in full size.

5. After machine work is complete, take a dremmel, and notch out a bigger valley in the tail housing. You will notice there was one there Before machine work, but after there will not. So you have to make a valley to the trany fluid will flow into the trany from the shifter hole.
Click the image to open in full size.

6. Install Viper bushing, keeping note of the trany filling hole, and the new valley in the tail housing. The new bushing is longer than the stock, go a head and install the new bushing all the way down, till it is flush.
Click the image to open in full size.

7. Install Viper Seal.
Click the image to open in full size.

8. Tail housing work is complete.
Click the image to open in full size.
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Last edited by roadtrip120; 08-07-2008 at 02:13 AM..
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Old 08-10-2007, 07:24 PM   #2
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Install
9. Take apart t-56 completely
10. Reinstall all parts back on new Viper t-56 main shaft, Install new baring at this point.
11. Install new 10T Speedo reluctor gear, and the needed two snap rings.The stock t-56 shaft is smaller, thus the stock t-56 snap rings are smaller than the Viper. NOTE- stock is 17T you will have to have a retune on your pcm and have it change from 17T to 10T.
Click the image to open in full size.
You could call D&D and order a 17T converted to a 30 spline shaft but it would raise the cost of the swap. And since most of the cars doing the swap will already have there cars tuned, it will not be much to have it retuned.

Total Cost =$527.24

Thatís a lot cheaper than 900.00 and a 250.00 for a tail housing core deposit.


Good Luck to all pm for more pic's or help.
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94 Z-28 Fastest N/A 6spd LT110.075 at 135.6mph 1.48"- N/A - 1550ft DA on E85 541rwhp 463rwtq
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385 LT4, Dart LT1 Pro 1, Single Plane, Jessel Belt Drive, Face Plated T56, 9", XFI, Strange Brakes, AFCO's, Madmad/BMR Suspension
97 WS6 LS1 Swap 490hp 438tq

Last edited by roadtrip120; 08-11-2007 at 01:21 PM..
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Old 08-10-2007, 07:30 PM   #3
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damn, that's some good info to have, thanks
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Old 08-11-2007, 10:55 AM   #4
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One thing is that is to expensive for the machine work and the shaft. I have the shaft for $225 with free shipping and they should not charge you more than $50 to machine the mainshaft. It takes us about 15 minutes to cut a mainshaft, 30 minutes to bore the tailshaft housing and install the seals. This is very good info for the do it yourself guy but the machine work not everyone has the tooling to do.

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Old 08-11-2007, 11:58 AM   #5
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how much stronger would that acually make it? im gonna rebuld my t56 this winter, im a machinest some machine work wouuld be free. is it worth the trouble?
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Old 08-11-2007, 01:18 PM   #6
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Quote:
Originally Posted by Six Speeds Inc.
One thing is that is to expensive for the machine work and the shaft. I have the shaft for $225 with free shipping and they should not charge you more than $50 to machine the mainshaft. It takes us about 15 minutes to cut a mainshaft, 30 minutes to bore the tailshaft housing and install the seals. This is very good info for the do it yourself guy but the machine work not everyone has the tooling to do.

Amber
Six Speeds Inc.

I dont have the tooling to machine these parts, but after the 7th machine shop i was ready to pay. The shaft price was with shipping, so i guess you are cheaper.

So, can customers send you there tail housings ready to be machined? Can they also buy the Viper main shaft already cut down for 275.00??


If you charge $50.00 for 15min worth of work do you charge $100.00 for 30 min?? Because then you would be higher than what i got mine for local.

Just trying to help out the "do it yourself guy", that doesn't have deap pockets.
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06 Z06 PRC 265cc, Pfadt Headers, TSP LS7R Cam
94 Z-28 Fastest N/A 6spd LT110.075 at 135.6mph 1.48"- N/A - 1550ft DA on E85 541rwhp 463rwtq
-2010 LTX Shootout MOD N/A #1 Qualifier -2008 LTX Shootout MOD N/A Champion / 6SPD Runner Up -2011 EX Street Runner Up
385 LT4, Dart LT1 Pro 1, Single Plane, Jessel Belt Drive, Face Plated T56, 9", XFI, Strange Brakes, AFCO's, Madmad/BMR Suspension
97 WS6 LS1 Swap 490hp 438tq

Last edited by roadtrip120; 08-11-2007 at 01:27 PM..
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Old 08-11-2007, 01:59 PM   #7
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Quote:
Originally Posted by roadtrip120
.If you charge $50.00 for 15min worth of work do you charge $100.00 for 30 min?? Because then you would be higher than what i got mine for local.
a lot of machine shops charge a min fee. usually like 1 hr depending on the shop. i know my work charges 1hr min weather it takes 15mins or 45mins you pay for an hr. of chorse some shops may be different.
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Old 08-11-2007, 02:07 PM   #8
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I believe this calls for a sticky!
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Old 08-11-2007, 02:58 PM   #9
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that is really cool of you to do a write up like this. thanks!!!
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Old 08-11-2007, 03:25 PM   #10
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awesome write up, another vote for sticky!
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Old 08-11-2007, 04:22 PM   #11
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Your Welcome

I figured it was time to share some knowledge, thats what the forums are for.




ALSO

You can buy your rebuild parts from Blumenthals, they are cheaper than ebay. The only thing is i'm not sure if the block rings are the same quality as the supporting venders. But the gears and syncro's themselves are thremic, just cheaper.
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-2010 LTX Shootout MOD N/A #1 Qualifier -2008 LTX Shootout MOD N/A Champion / 6SPD Runner Up -2011 EX Street Runner Up
385 LT4, Dart LT1 Pro 1, Single Plane, Jessel Belt Drive, Face Plated T56, 9", XFI, Strange Brakes, AFCO's, Madmad/BMR Suspension
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Old 07-28-2008, 05:24 PM   #12
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I've done the mechanical speedo conversion on my T56 and would need a 7 tooth drive gear for the viper main shaft. Are these available?

I do a number of the speedo conversions and the viper conversion is common question for me. I just found this thread and if any or my customers for the speedo conversion want me to machine the tail housing to viper specs, this thread is pure gold to me!!! Thanks for sharing the info.
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Old 07-28-2008, 09:01 PM   #13
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Quote:
Originally Posted by alloy View Post
I've done the mechanical speedo conversion on my T56 and would need a 7 tooth drive gear for the viper main shaft. Are these available?

I do a number of the speedo conversions and the viper conversion is common question for me. I just found this thread and if any or my customers for the speedo conversion want me to machine the tail housing to viper specs, this thread is pure gold to me!!! Thanks for sharing the info.
How much would you charge to machine the tail housing?
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Old 07-29-2008, 01:05 AM   #14
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Quote:
Originally Posted by squee View Post
How much would you charge to machine the tail housing?

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Old 07-29-2008, 10:48 PM   #15
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Thanks for sharing this info... Great write up!!!
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Old 07-30-2008, 12:54 AM   #16
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I saw you in gmht as LTX n/a champ nice, awesome write up
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Old 08-01-2008, 10:59 AM   #17
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Good job on being able to complete a really good write-up to help us DIY guys while still giving credit to the vendors with the best deals as not to totally upset the balance of how the politics work on this board.

Now after being enlightened by the info you shared, I await the arrival of a vendor (not Amber at Six Speed Inc. because they are cool helpful people) to come in and tell us how doing it yourself is stupid and hurts trained professionals that have countless hours of training and $5000 tool kits for this kind of stuff. We are taking food off their table, lol.

Sorry for the rant but the above happens on too many threads on here, especially good threads like this. Thanks again for sharing!
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Old 08-02-2008, 01:12 AM   #18
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Pretty nice writeup. Still for the extra $400, Ill let a pro do it. I guess i am not quite ready to rehab a tranny, lol.
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Old 08-02-2008, 03:05 PM   #19
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Nice write up. Exactly what I was looking for

Is building a transmission REALLY as difficult as everyone says. Can it be compared to anything else on the car as far as difficulty goes? I'm willing to try but I don't want to get halfay through and give up.
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Old 08-02-2008, 03:20 PM   #20
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Quote:
Originally Posted by Pretyflywiteguy View Post
Nice write up. Exactly what I was looking for

Is building a transmission REALLY as difficult as everyone says. Can it be compared to anything else on the car as far as difficulty goes? I'm willing to try but I don't want to get halfay through and give up.
From what I've read, its not difficult at all. Just a couple special tools. You need something like a gear puller, but it has to have extensions so to speak for the length of the main shaft, and your gonna need a press. Other than that, I don't think theres all that much to it.
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