3.42 diff question
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 25
From: Austin Texas
The differential housings are different, the gears for the A4 are physically smaller as well as a different ratio. 3.42 gears are made for the larger housing manual trans. From what I understand somebody is making smaller 3.42 gears that will fit the smaller housing.
Also; The complete manual diff won't interchange either due to bolt patterns, input/output shaft diameters and lengths.
Your best bet is to contact any of the Forum Vendors that do rear gearswaps, they can explain the options better than I can.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
From previous posts over the last couple of years;
The differential housings are different, the gears for the A4 are physically smaller as well as a different ratio. 3.42 gears are made for the larger housing manual trans. From what I understand somebody is making smaller 3.42 gears that will fit the smaller housing.
Also; The complete manual diff won't interchange either due to bolt patterns, input/output shaft diameters and lengths.
Your best bet is to contact any of the Forum Vendors that do rear gearswaps, they can explain the options better than I can.
The differential housings are different, the gears for the A4 are physically smaller as well as a different ratio. 3.42 gears are made for the larger housing manual trans. From what I understand somebody is making smaller 3.42 gears that will fit the smaller housing.
Also; The complete manual diff won't interchange either due to bolt patterns, input/output shaft diameters and lengths.
Your best bet is to contact any of the Forum Vendors that do rear gearswaps, they can explain the options better than I can.
Safety Car
Joined: Jan 2008
Posts: 4,711
Likes: 3
From: Middle of No where AK
If they are from the same year they should work. I believe they changed the case and mounts in 06+ due to the "weak" rear in the 05 models. RPM sells and adapter or something of the sort so 05 guys can put 06+ rears in.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
if i put the second generation rear in my c5 i have to use the rpm adapter and an 06-10 manual case housing and side covers, i can buy that from gene culley, and use my 05 ring and pinion with my 05 differential, what changed was the housing, the a6 housing is different
Safety Car
Joined: Jan 2008
Posts: 4,711
Likes: 3
From: Middle of No where AK
if i put the second generation rear in my c5 i have to use the rpm adapter and an 06-10 manual case housing and side covers, i can buy that from gene culley, and use my 05 ring and pinion with my 05 differential, what changed was the housing, the a6 housing is different
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
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Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
Instructor
Joined: Aug 2007
Posts: 190
Likes: 0
From: Costa Mesa Ca
The 3.42 differential from a 2005 mn6 will bolt right up to your 2005 a4, no modification required. You will have to reprogram the computer however. Everything is a straight remove and replace bolt on.
You only run into problems when you try to put a 2006+ differential onto a 2005 tranny.
You only run into problems when you try to put a 2006+ differential onto a 2005 tranny.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
The 3.42 differential from a 2005 mn6 will bolt right up to your 2005 a4, no modification required. You will have to reprogram the computer however. Everything is a straight remove and replace bolt on.
You only run into problems when you try to put a 2006+ differential onto a 2005 tranny.
You only run into problems when you try to put a 2006+ differential onto a 2005 tranny.
