I already have a 2.41 and a 2.73, I'm really hurting for a 2.56 can you get the numbers of the ring?
Rear Gear question
- Thread starter 85Caballero350
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Engine? Cam specs? Vehicle? Is it used for towing? Without knowing the car, I would say 3.23. I would also put an overdrive trans in it if it sees lots of driving because of the fuel economy. The TH200 4R uses the same 1st-3rd ratios but with a .67 OD 4th. Plus, it bolts in to most 85-88 G bodies with no mods. I have that combo and am very happy with it.
Re: The Best Rear End For A TH-350
3.08 was the GM standard with the 3 speed trans for a long time. It won't make the car really quick off of the line, but it will go pretty good and still get decent fuel mileage.
amwworks said:
3.08 was the GM standard with the 3 speed trans for a long time. It won't make the car really quick off of the line, but it will go pretty good and still get decent fuel mileage.
A limited slip & posi are the same thing. Both wheels will lay black marks, but yet lets the inside wheel turn faster in a corner when the clutches aren't locked.
A spool is when both axles are locked together full time, which you don't want for street driving.
A spool is when both axles are locked together full time, which you don't want for street driving.
Posi-Traction was Chevy's marketing name for a Limited Slip Differential (LSD) in the 60's and 70's. Twin Grip was Mopar's, Twin Traction I believe was Studebaker's, Twin Grip was AMC's, Traction Lock was Ford, etc. ( Hope I got all those right...)
In addition to a LSD or a Spool, there are a few other choices to consider. One is a locker, which locks in a straight line and unlocks when the axle load changes. Another is a Helical LSD which is great for road racing as it uses gears instead of clutches to lock the wheels together, an Air locker which uses air pressure to lock the wheels on demand, but reverts to a open diff when not activated, and lastly is the electric locker which works like an air locker but uses electromagnetism rather than air pressure to lock the diff. In a mild street application, the LSD is usually best, but if the engine is rather powerful, you may wish to upgrade to something other than the stock 7.5 axle as it can't hold alot of torque.
In addition to a LSD or a Spool, there are a few other choices to consider. One is a locker, which locks in a straight line and unlocks when the axle load changes. Another is a Helical LSD which is great for road racing as it uses gears instead of clutches to lock the wheels together, an Air locker which uses air pressure to lock the wheels on demand, but reverts to a open diff when not activated, and lastly is the electric locker which works like an air locker but uses electromagnetism rather than air pressure to lock the diff. In a mild street application, the LSD is usually best, but if the engine is rather powerful, you may wish to upgrade to something other than the stock 7.5 axle as it can't hold alot of torque.
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