D-36 to D-44

Jsup

Well-known member
Joined
Oct 31, 2008
Messages
812
Do I need to change the bat wing on a 1990 if I change the rear?

I know a need a new driveshaft..

Thanks
 

BBShark

Garage Monkey
Staff member
Joined
Mar 5, 2008
Messages
4,588
Location
Right here
They look different in this illustration. Certainly the top holes are different and the lower center bolts.


Dana4436compare.jpg
 

Twin_Turbo

Der Maulwurf
Joined
Mar 5, 2008
Messages
7,572
Yes, the D36 batwing does not fit the D44 case, also you need a D44 c beam or drill a couple of new holes in your old one.

Here's JoBy's write up on the swap:
______________________________________________
I started to hear a knocking sound from the rear.
It got louder and louder every day.
I had it on a lift and checked all U-joints, but I could not find anything wrong.
It was knocking three times for every turn of the rear wheels.
When I accelerate or engine brake the sound would go away.
Today I removed the rear axle to check it out.

DSC02040.jpg

DSC02042.jpg

DSC02045.jpg

I found the problem!
Some teeth on the pinion gear are cracked!
I took the diff apart and the teeth was even worse than it looked at first.
One of them was broken ALL the way thru!
All bearings seem to be in good condition.

Check this video out (215k)! It is loose, it just did not fall out of place!

http://www.joby.se/corvette/mods/2001-0X11_diff/tooth.mpg

DSC02049.jpg

It is amazing that it did not break into pieces ...

DSC02296.jpg

Found a crack in the housing also, it is one on the other side too ...

DSC02299.jpg

Dana 36 and Dana 44. (Dana 44 on top)

DSC02259.jpg

DSC02259b.jpg

DSC02270.jpg

DSC02271.jpg

The C-beam did not fit very well with the Dana 44

DSC02272.jpg

Fixed that with new holes:

DSC02291.jpg

The original driveshaft was not too long once in place, but it was impossible to install without unbolting the c-beam and dropping the rear of the tranny a bit.

DSC02288.jpg

Only an 1/8 inch margin when installed, but that is enough.

DSC02294.jpg

DSC03933.jpg

DSC03934.jpg

DSC03937.jpg
 

Jsup

Well-known member
Joined
Oct 31, 2008
Messages
812
I see the above says the drive shaft was not too long, seems to be contrary to my understanding
 

Twin_Turbo

Der Maulwurf
Joined
Mar 5, 2008
Messages
7,572
It's a bit long, but he had 1/8th clearance left. If it turns out it doesn't fit after all you can always have it shortened. There's no arguing with factual data, whatever others may say, Jonas did the install.
 

guru

Well-known member
Joined
Mar 25, 2008
Messages
393
I think somebody in the corvetteforum C4 parts section is selling an adapter plate.
 
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