General ?'s
Thread Starter
Intermediate
Joined: May 2008
Posts: 34
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General ?'s
Happy Thanksgiving people....
Future owner here wanting to get some knowledge on differentials. I know that c4's have the 44's with the manuals ( except for 84). Can somebody give me the applications for the c3's? I've also read there is a difference from 79 to 80 set-ups including suspension. I will probably be looking at 75 on up due to my funds. Would also like to mod it a little hence my question on diff. strength. This is the best vette forum so I am looking foward to your reply's. Thanks in advance and again happy holidays Mike
Future owner here wanting to get some knowledge on differentials. I know that c4's have the 44's with the manuals ( except for 84). Can somebody give me the applications for the c3's? I've also read there is a difference from 79 to 80 set-ups including suspension. I will probably be looking at 75 on up due to my funds. Would also like to mod it a little hence my question on diff. strength. This is the best vette forum so I am looking foward to your reply's. Thanks in advance and again happy holidays Mike
Drifting
Joined: Sep 2006
Posts: 1,259
Likes: 2
From: MS
63-79 IRS differential was built by GM and is pretty strong (L88, LS6, etc.)
80-82 was a Dana 44 and is not as strong
The suspension is similar but the Dana used a different mounting setup so only the GM unit can be used on 63-79 cars without mods and vice versa.
63-79 GM factory ratios: 2.73, 3.08, 3.36, 3.55, 3.70, 4.11, 4.56
80-82 Dana factory ratios: 2.72, 2.87, 3.07
80-82 Dana aftermarket ratios: 3.31, 3.54, 3.73, 3.92, 4.09
80-82 was a Dana 44 and is not as strong
The suspension is similar but the Dana used a different mounting setup so only the GM unit can be used on 63-79 cars without mods and vice versa.
63-79 GM factory ratios: 2.73, 3.08, 3.36, 3.55, 3.70, 4.11, 4.56
80-82 Dana factory ratios: 2.72, 2.87, 3.07
80-82 Dana aftermarket ratios: 3.31, 3.54, 3.73, 3.92, 4.09
Drifting
Joined: Sep 2006
Posts: 1,259
Likes: 2
From: MS
Not that familiar with C4 but think C3 is different from that used in C4.
C4 I think was Dana 36 for automatic and Dana 44 for manual.
All 80-82 whether auto or 4-speed were Dana 44 but front yoke and u-joint was smaller for auto.
Think the front bracket is a little different 63-65 but definitely all 66-79 units will interchange.
Gary (GTR1999) is the diff specialist and will correct if I am wrong.
C4 I think was Dana 36 for automatic and Dana 44 for manual.
All 80-82 whether auto or 4-speed were Dana 44 but front yoke and u-joint was smaller for auto.
Think the front bracket is a little different 63-65 but definitely all 66-79 units will interchange.
Gary (GTR1999) is the diff specialist and will correct if I am wrong.
