the problem i have is 1st gear is rubbing on the ring gear. Upon further inspection, when installing the countershaft, it lifts the diff and makes it hit 1st. I found this by testing the wear pattern on the counter and ring gear.

I have pics to help understand:

diff with no counter in place


Counter in place


wear pattern


this is a GSR case, GSR diff and what is supposed to be a GSR gear stack


the customer has informed me that he isnt really sure what the gear stack came out of but its supposed to be GSR. With the gear stacks i pulled out, he said the trans whined really bad on the highway. I didnt look at the ring gear and 1st gear when i initially broke it down. I havent had the chance to grab the counter that came out of it and see if it does the same thing but other than the current counter not being from a GSR, what could cause this?

thanks

 

Blake, your photos don't show the diff lifting up once the CS is installed. I'm presuming that is indeed a GSR ring gear, as it looks to be an OEM GSR LSD.

What is the tooth count for the countershaft?
That is odd wear, but have you made note of the wear pattern of the pinion with the CS locked into place in the c-clip?
Have you tried the paint with a known GSR countershaft?
What is the inner height of the 1st gear?
What is the thickness of the washer at the base of the CS below 1st?
Hard to see, but is there any scoring/wear on the face of the CS needle bearing?

Good luck!

 

pictures are hard to tell but the cs side of the diff lifts up with the cs in place. I will count the teeth later today and yes i am was planning on taking a couple other CS i have in a box and see what they do as well.

No, i have not tested with the c-clip in place because i had not run into this problem before since there is a specific clearance necessary with the top case off between the ring gear and first gear.

the washer under 1st gear is 2.0mm.

have not checked 1st gear height, will later.

 

OK. I see exactly what you mean now. You'll have to factor in that they are tapered roller bearings on the diff, and will allow for that type of movement with the upper case off - given that the other bearing race is not keeping that top bearing confined in position.

Which is exactly why you need to use the paint and take a reading of the gear contact with the case on and the countershaft in place. Without that case in place, you are getting a potential false reading due to those bearings and CS height as to where it rests. You just gotta make sure the pinion teeth you paint don't end up against the ring gear when you open the c-clip up to remove the case again.

Even so, I don't recall a tapered bearing diff moving like that with the correct CS in place, so I'd be concerned you've had an incorrect CS/RG combo provided to you - especially given the whining the customer heard when driving.

Not sure what you mean here. EVERY trans I have done, the CS 1st gear rests on the ring gear (or damn close!) until the CS gets pulled up in place.

Good luck, Blake!

- Shaun

 

It looks like a mis matched C/S and R/G. The countershaft for all Hydro 4.40 ratio B series FD's will have 3 ID marks on the tooth face of the C/S gear. It looks like your C/S has 2 ID marks which would make it an LS. The 4.266 LS C/S has 2 ID marks and 15 tooth count matched with a 64 tooth R/G and the 4.40 B16/GSR/ITR has 3 ID marks and 15 tooth count matched with a 66 tooth R/G.

 

what do you mean by ID marks?

i know the diff and r/g are factory GSR. the CS has 15 teeth but im not sure what you mean by ID marks.


thanks

 

The small indents on the circumference of the teeth - the very tip. That pinion you have has two in each tooth.