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TBI Motor, What Gears are you running?

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Old Mar 2, 2020 | 07:16 AM
  #1  
TimRS's Avatar
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From: McDonough, GA
Car: 1991 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.42
TBI Motor, What Gears are you running?

All you guys still with the 305 TBI and 700R4, what rear end gear you running? I'm updating to a 3:42 this weekend and wondering how others have done.
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Old Mar 2, 2020 | 09:22 AM
  #2  
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From: South Ms
Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: TBI Motor, What Gears are you running?

Im running 3.73s Made the car feel so much better but honestly just a bit steep for the puny engine. Id imagine 3.42s would be PERFECT.
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Old Mar 3, 2020 | 06:58 PM
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From: MICHIGAN
Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: TBI Motor, What Gears are you running?

I have a set of 3.42s for mine Tim. Haven't installed them though. Let us know how you like 'em.
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Old Mar 5, 2020 | 08:38 AM
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TimRS's Avatar
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From: McDonough, GA
Car: 1991 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.42
Re: TBI Motor, What Gears are you running?

Originally Posted by DynoDave43
I have a set of 3.42s for mine Tim. Haven't installed them though. Let us know how you like 'em.
Will do. We've been getting a ton of rain here in the Atlanta area. It is suppose to let up Friday so hopefully I can get this done Saturday and a test drive on Sunday. I'll keep you posted.
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Old Mar 9, 2020 | 09:16 PM
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TimRS's Avatar
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From: McDonough, GA
Car: 1991 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.42
Re: TBI Motor, What Gears are you running?

Ive got the 3.42s installed and went through the break-in process today. Initial reaction is that they run and drive very smooth. Seems a bit more responsive down low but I really haven't pushed it hard yet. More to come once this rain moves out.
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Old Mar 17, 2020 | 01:52 PM
  #6  
TimRS's Avatar
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From: McDonough, GA
Car: 1991 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.42
Re: TBI Motor, What Gears are you running?

So I take my Camaro up to get a minor exhaust leak welded up on the intermediate pipe. While on the lift I was inspecting the the work done in and around the rear end from the ring and pinion install. On my passenger side left rear wheel I could see what looking like oil spinning out and onto the wheel and tire. My first thought was the axle seal was leaking. Once we took the wheel off we were surprised. The wheel cylinder had ruptured and was leaking brake fluid all over the wheels and shoes which also explained my spongy brake pedal. Now I'm replacing both wheel cylinders. Still have not really had the chance to push the gears and see just how much of an improvement it made. I'm getting impatient.
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Old Mar 18, 2020 | 07:40 AM
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From: MICHIGAN
Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: TBI Motor, What Gears are you running?

Originally Posted by TimRS
So I take my Camaro up to get a minor exhaust leak welded up on the intermediate pipe. While on the lift I was inspecting the the work done in and around the rear end from the ring and pinion install. On my passenger side left rear wheel I could see what looking like oil spinning out and onto the wheel and tire. My first thought was the axle seal was leaking. Once we took the wheel off we were surprised. The wheel cylinder had ruptured and was leaking brake fluid all over the wheels and shoes which also explained my spongy brake pedal. Now I'm replacing both wheel cylinders. Still have not really had the chance to push the gears and see just how much of an improvement it made. I'm getting impatient.
So am I!

Look forward to hearing how you like them.
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Old Mar 18, 2020 | 08:49 AM
  #8  
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From: Minnesota
Car: 1991 camaro RS
Engine: 408 Stroker
Transmission: 4L80e
Axle/Gears: 3.42
Re: TBI Motor, What Gears are you running?

I got a rear end from a 4th gen that already had 3.42s. It was a noticeable difference. I also installed relocation brackets, LCA's and a new panhard bar.
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Old Mar 22, 2020 | 06:22 PM
  #9  
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From: McDonough, GA
Car: 1991 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.42
Re: TBI Motor, What Gears are you running?

Originally Posted by Camaro91327
I got a rear end from a 4th gen that already had 3.42s. It was a noticeable difference. I also installed relocation brackets, LCA's and a new panhard bar.
What did you do about the extra length of the rear end? Got any pics?
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Old Mar 22, 2020 | 06:28 PM
  #10  
TimRS's Avatar
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From: McDonough, GA
Car: 1991 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.42
Re: TBI Motor, What Gears are you running?

Finally got the wheel cylinders installed and the brake system is back to normal if not better than new. Also was lucky enough to have the car up on a lift and found a wire with a fuseable link going to the alternator in poor shape. It was an original wire so it was about 30 years old. Replaced it and got her back on the road for a brief test drive before the rains came AGAIN. Very noticeable difference with the 3.42 gears. Nice pull through 1st and 2nd gears. Launches really good. I'm very pleased. I would recommend these to anyone with a LO3 and 700R4.
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Old Mar 22, 2020 | 07:40 PM
  #11  
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From: Minnesota
Car: 1991 camaro RS
Engine: 408 Stroker
Transmission: 4L80e
Axle/Gears: 3.42
Re: TBI Motor, What Gears are you running?

Originally Posted by TimRS
What did you do about the extra length of the rear end? Got any pics?
Went out to the garage to get a couple. I picked up my 4th gen rear for $250 and it came out of a 01 Camaro SS. Mainly I wanted the disc brakes in the back but the 3.42's was a nice addition. The extra width didn't bother me with stock 15 inch wheels.



Never mind the missing nut for the torque arm. It is coming off for a different project.

















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