Slug 87 Roadster
Thread Starter
Instructor
Joined: Nov 2002
Posts: 131
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From: Tacoma Wa
Slug 87 Roadster
My 87 roadster has no where near the performance my 85 coupe had. Though the 85 may have had a chip (I bought both cars used) I think the difference is rear end gears. Am I correct in assuming the 85 auto had a dana 44 3.08 gears & my 87 auto has the dana 36 2.57 gears. Anyone know the codes so I can check the console cover? And if so what do I need to change the 87s to 3.08s? A whole differential or can I just get gears.
Thanks
Bill
:flag
Thanks
Bill
:flag
Racer
Joined: Jun 2001
Posts: 435
Likes: 0
From: How did I get here? AZ
Re: Slug 87 Roadster (BILLYD)
factory autos have the dana 36 rear, manuals had the 44. if you have a G44 or G92 code listed, then its a 3:07 rear, if not its the 2:59. you should be able to just change the ring and pinion, if you want to swap ratios.
Team Owner
Joined: Sep 2001
Posts: 62,153
Likes: 1,731
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Slug 87 Roadster (dgoodhue)
Your 87 conv. should have 2.73:1 (GU2) as the base rear end. But it could have 3.07 (g44) or 2.59 (gm1)
85 autos also had the D36 carrier. No automatics in the C4 line came with D44 carriers.
You might need a tune-up, or your butt just doesnt like the 2.59/2.73.
Intermediate
Joined: Mar 2003
Posts: 32
Likes: 0
From: pasadena ca
Re: Slug 87 Roadster (BILLYD)
if it runs out of power at around 3000 rpm or so., it could be a clogged convertor. is it quiter than your other vette? take it to a muffler shop and have then drop the pipe in front of convertor.
