MeanWS6

Ok, after a hundred posts on the TH400 (thanks everyone , hopefully we can get a trans FAQ together ) I think I put together the “perfect” TH400 for my mods (see sig). Will be driven on the street, not daily but on the weekends or if I take her to work or something. Looking for better 60ft times and a trans I will NEVER have to replace again. Will also be spraying a 150shot.

PLEASE let me know your input, what you would change or add.

- TH400 with trans brake
- Manual valve body
- 34-element HD sprag
- 2.75 upgrade (or should I go with 3.00???)
- JW ultra bell
- Deep Pan
- TCI Flexplate
- B&M 24,000GVW cooler
- Gear Vendors OverDrive Unit (with this I will NOT need speedo kit??)
- 4000 stall (not sure what name brand, is this too much for spray)
- Custom driveshaft
- Lokar Dipstick
- Spohn Torque Arm
- Autometer Trans Temp gauge
- Autometer Pro Shift lite /w pills
- Cheetah SCS 70073B TURBO ACTION GM REVERSE GATE PLATE
- GM M6 console

I am I missing anything???

john kilgore

if there was a th400 available that used your stock d shaft, trans mount,and torque arm, would you be interested?

SmokingWS6

iTrader: (1)

I thought you were gonna get the 4L60 working correctly first?

LT1 ANDY

iTrader: (4)

Thats what i have pretty much.

Heads cam LT1 X-6speed car

Coan Competition Class TH400
2.48 first (though)

3800 stall converter (for spray)
Steel driveshaft
6speed console
B+M race cooler
sixspeed crossmember works GREAT



Shifts awesome does what it is supposed to and i know it wont break, dont miss the M6 one bit.

Navy David SS

iTrader: (13)

Looks good.

Mine is about the same, except the 2.75, OD and temp guage.

4000 stall should be OK on nitrous. I plan on running mine on motor only most of the time and nitrous only ocassionally. I HAD a 4000, just sent it back to be re-stall to 4800. This should get me the 60's I want.

David

KRAZY K 2000 TA

iTrader: (5)

IF your turbo 400 has a trans brake its already got full manual valve body,thats what a trans brake kit is.Denny,s drive shaft,BMR trans crosmember part #TCC001 dont cobble it up looks and reliability are every thing,I do not believe there is enough room to fit a gear vendors overdrive in there because we have to run torque arms on our f bodies,Look at BMR,s site or SPOHN,s for pictures of there torque arms they mount to where the brace goes,why the ultra bell?I copied everything DERTY did to put his turbo 400 in he had great pictures. there is a way to make a speedo work but since turbo 400,s never had any electronics for speedos it is not easy.I cannot remember the part #s for the reluctor and pickup for the trans.someone out there has them there GM part numbers .

12secSS

iTrader: (30)

As I posted on a different thread below ...

MeanWS6

so dont get the ultra bell?? why?

From all of my research, the GV OD unit will work on the f-body

T/A Medic

iTrader: (1)

the guy building my Th400 warned me that a 3.0 would hit too hard with what I plan on doing to it... lots of nitrous ... for motor i am sure it would be just fine... since 4l60e is 3.06 but put a lot of nitrous through ur car and he warned of poor 60fts and ETs ... by lots i mean over 200

MeanWS6

ok, maybe I will stick with the 2.75 first gear.
Any other comments on this setup?

How about that ultra bell and GV OD unit?

KRAZY K 2000 TA

iTrader: (5)

i was just worried that there might not be enough room with the gear vendors over drive on it might hit the torque arm thats all.the ultra bell is a great piece just not really needed.unless u just want it.It does not really make the trans more reliable.I dont think it does anyway.?

john kilgore

careful if the 2.75 is all welded together, should have no welding. the welding moves everything around, very difficult to keep it straight with all that heat. noisy and short lived. tolarances .001 per inch of parallal mating of gears.

Titanium

iTrader: (6)

Correct me if I'm wrong but I believe the GearVendors OD unit is about 2K by itself.

MeanWS6

yes, it is $2200
So, I am looking at over 6K installed, but thats about the cost of 3-4 4L60e rebuilds - well worth it


Should I get the JW bell, or no?

SmokingWS6

iTrader: (1)

Turbo 400's are suppose to be a costeffective option when you increase your HP, I think your going down the wrong path spending 6k on a transmission that may not improve anything. If you really want an overdrive unit, I suggest a 4L85E transmission.

john kilgore

josh, perhapes if you knew the formula for the 4L60 ratios you would see why it is at best "no good" here goes one more time first you have to understand that a 4L60 has only two planet sets. the front one is low, 3.06 the other is overdrive 30% there is no second gear in that trans. second is arrived at by overdriving low. the math is (3.06-1)X.30(.30 is the od ratio)=.62+1=1.62. what do you think the 2-4 band does. the trans can never live without a big number in the rear end, min. 3.73. so goes the lesson for the day

SmokingWS6

iTrader: (1)

I understand that. My point was that he thought 4L60's can't launch when really he wasn't taking off in first gear due to a tuning or valve body issue. No use in dropping a few grand when all ya need to do is push a few buttons on an editor and get rid of any torque management issues, unless you really want to then go for it, i'm a firm supporter of the 400.