im doing the auto to manaul t5 conversion. i have a 85 camaro, i have tryed a 85 and 87 flywheel nether of them works. which flywheel do i need? on the auto flexplate the main center hole is about 2in. on both the new wrong flywheels they are about 2.5in. need help!

 

You need a flywheel for a 2 peice rear main seal. The one for the 85 should have worked. Maybe someone put a later model engine in the 85.

 

I dont know what size you need, but if both the 85 and 87 flywheels are 2.5" then they're not 85 and 87, they are the same.

 

i have a replacement engine in it. so i dont know what flywheel to get.

 

Is the crank flange absolutely round, or is it sort of funky shaped and irregular?

If it's perfectly round, you need a 86-up flywheel.

If it's the irregular shape, you need a 83-85 flywheel.

If you have 2 flywheels and one is "supposed to" be a 87 and the other is "supposed to" be for a 85, and they're the same, then whoever was doing the "supposing", wasn't doing it hard enough. The correct flywheels for those 2 applications are different.

Sounds to me like you have 2 83-85 ones, not a 85 and a 87.

You need one of the 2 flywheels that's available for 86-up V8/T-5 Camaro/Firebird. You will find that there are 2; one that was used on the high-perf motors (L69 and LB9), and one that was used on the grocery-cart motors (LG4 and L03). The difference is the weight: about 16 lbs vs about 22 lbs. You'll probably do better with the lighter one.

Don't forget to put a pilot bushing or bearing inthe crank. Your transmission WILL be destroyed if you don't, and quickly.

 

thank you so much bud. you save me a big headark.