LT1-LT4 Modifications 1993-97 Gen II Small Block V8

3-Speed guys come in

Old Aug 17, 2006 | 06:19 AM
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Default 3-Speed guys come in

Need to hear from the LT1 guys with 3-speeds. I'm going with a TH-350 for my setup because I dont want to deal with my 4l60. I figure I do very little highway driving so Ill be fine. How does your 3 speed handle in the city?
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Old Aug 17, 2006 | 07:41 AM
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From: ringgold,ga
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it should be like driving around in drive. all automatics are one to one in high gear or 3rd. so the only diff. you should see is in the torque conv. i had people tell me before my swap that a turbo 350 would slow me down due to the higher first gr. ratio. that is the furtherest thing from the truth. anyone who tells you this doesnt have a clue. in fact my car went faster with the 350 and less conv. than with the 4l60 and higher stall. it did slow the 60ft. down slightly but was running 3-4 mph. faster in the 8th. after i changed to a conv. with the same stall speed as the 4l60 , the car picked up again. all total with equal stall, i picked up .5 tenths in the 8th. i would never go back to the 4l60. my stock turbo350 had a b&m shiftkit and lasted 3 yrs. my rear gear ratio is 3.50.
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Old Aug 17, 2006 | 07:46 AM
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I'm really starting to look foward to the swap. Not to mention the wieght saved I think this will really work to my advantage. Why do you only have 3.50 out back?
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Old Aug 17, 2006 | 08:10 AM
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gear ratio has not helped performance at all. i've tried 3.73s and even a 4.56. niether run any better than the 3.50s. the 60ft. is even the same. 1.43 on spray and 1.53 all motor.i did see a slight improvement when i went from 3.23s to 3.42s. i finally broke the 10blt. and installed a moser 9". which if i had it to do over again i wouldnt. the 9" robs more power than any other rear. slowed the car down .15 in the 8th. went from 7.09 to 7.24 all motor. i changed the cam and have picked it back up to 7.11. the new strange s60 rear is what i'd like to have. uses less power than the 9" and is stronger. convertor has really been the key on my car. i've changed it five times and its went faster every time.
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Old Aug 17, 2006 | 08:20 AM
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I was looking over your setup in another thread and I think I should be making the same power as you. I was thinking about going with 4.10's and a 4000 stall with the 3-speed but now I dont know.
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Old Aug 17, 2006 | 08:31 AM
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you wont like the 4.10s with the a3. atleast not driving around. i'm running a 28" tall tire and with 3.50s i can cruise on the freeway. with the 4.56s it sucks. choose the conv. that best matches up to your cam spec.s. although my cam spec's claim it comes in around 2500. that was not the case. its around 2900-3000. also conv.s dont always stall what they claim. luckily theirs a conv. shop locally that will change my stall speed for $150 and has a two day turnaround. i've bought three conv.'s and had two changed by them. this was over a three yr. period. i currently run a 10" ptc. its the same as a tci superstreet fighter with antiballooning plate.
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Old Aug 17, 2006 | 08:31 AM
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i have a built th350 for sale.

pm me if interested
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Old Aug 17, 2006 | 08:33 AM
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i'd run the gears you currently have first. then make the rear change later to see the diff.
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Old Aug 17, 2006 | 08:53 AM
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3.73's on the stock pcm will run out around 120mph. My buddies car is on the limiter going through the traps. he traps around 120ish with 3.73's, not sure what it would be with 4.10's

If your cars a 1/8th miler its not bad, but a 1/4 mile car a lower gear might be better.
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Old Aug 17, 2006 | 01:05 PM
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Handling? Trans swap will not affect handling of the car.

And typically you pick the rear gear for what you are trying to accomplish. Highway RPMs you want a higher gear ratio, if you want to run the best ET then you pick the tire/gear size to peak your RPMs at the end of the track.
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Old Aug 17, 2006 | 01:10 PM
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Originally Posted by Shon Herron
Handling? Trans swap will not affect handling of the car.

And typically you pick the rear gear for what you are trying to accomplish. Highway RPMs you want a higher gear ratio, if you want to run the best ET then you pick the tire/gear size to peak your RPMs at the end of the track.
Didnt mean handling in that aspect I meant it's manners. I really want to do this but I guess I'm looking for reasons not to though at the moment the pros outwiegh the cons. I just dont want to be driving 70 at 3500 rpm's lol. I had 4.10's on my last setup and it really wasnt that bad with the tc locked up.
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Old Aug 17, 2006 | 01:15 PM
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I did this and doing it again.
If I was going to be driving the car at all on the highway I would really think about this...I had a loud exhaust car so 60+MPH the noise was crazy and I only had 3.73s. But the car was in the powerband all the time!!!!

Just ride around in 3rd for a couple of weeks and decide if that is what you like, the RPMs will be close but expect 300-500 more since you do have 3rd gear lock up in the A4s. Gas is expensive so think about that too. I got 13MPG with my TH350/3.73/26" set up.

Track only car then who cares, go for it!
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Old Aug 17, 2006 | 01:27 PM
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Two words: Gear Vendors
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Old Aug 17, 2006 | 01:31 PM
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Originally Posted by thesoundandthefury
Two words: Gear Vendors
To bad those two words run around $2500 bucks. I wish I understood more how the GV works for example, with it each gear gets a overdrive but wouldnt the revs shoot up with each shift?

Hey shon, what gear would the 4l60 need to duplicate a 3 speed with lets say 3.73's?
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Old Aug 17, 2006 | 01:37 PM
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Originally Posted by Honda Hunter
Hey shon, what gear would the 4l60 need to duplicate a 3 speed with lets say 3.73's?
I dont understand the question.
If you have an A4 put it in 3rd, that is the 1:1 gear just like the A3.
If you are wanting to know what rear gear you need to get the same 1st gear ratio, that is ALOT more than you can get b/c the 3.06 A4 1st if NICE. I am going with a 2.75 1st and it will be slightly better than the M6/4.33 combo I used to run.

If you want to know what tire you need to be the same RPMs as an A4 in 4th gear with 3.73s and 26" tall tires that would be an A3/3.73/38" tire combo.
Or you could do an A3/26"/2.73 combo and turn the same RPM....this is all at 60MPH...
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Old Aug 17, 2006 | 01:39 PM
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That's what I was looking for, thanks.
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Old Aug 17, 2006 | 02:20 PM
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Not to butt in but I was contemplating a TH350 after I blow up my 700r4. I was going with the 3.50 rear gear with a lockup converter. That way it would still be halfway streetable.
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