Question 63 close ratio tooth count

[Edward J.]

Does anyone know the gear tooth count on the 63 close ratio 4 speed??

[Peter M.]

Re: Question 63 close ratio tooth count

Ed,
If it's a Muncie the main drive (clutch) gear is 26T. The cluster is 27T,22T, 19T, 17T.
If it's a Borg Warner I would have to do some looking.
Kind regards

[Edward J.]

Re: Question 63 close ratio tooth count

Pete , yes it is a Borg Warner t10 , I should have post the Trans type. Thanks Ed

[Chris D.]

Re: Question 63 close ratio tooth count

Made me look. 27t main drive gear, cluster 28, 23, 20, 17 for the close ratio Borg Warner box.

[Edward J.]

Re: Question 63 close ratio tooth count

Made me look. 27t main drive gear, cluster 28, 23, 20, 17 for the close ratio Borg Warner box.

Chris is it possible that the C/R cluster gear tooth count for 63 t10 is- 28,23.19.17. I found a nos cluster gear with this gear count. Thanks, Ed

[Chris D.]

[Chris D.]

Re: Question 63 close ratio tooth count

Chris is it possible that the C/R cluster gear tooth count for 63 t10 is- 28,23.19.17. I found a nos cluster gear with this gear count. Thanks, Ed

Ed,
You're right, it has to be 19 for the listed 1.64 second gear ratio to calculate correctly. 30/19 * 28/27 = 1.637. I either misread the parts book or need to make a correctional notation. Looks like you have the cluster you are looking for.

Chris

[Edward J.]

Re: Question 63 close ratio tooth count

Chris I believe your first post on tooth count is correct, I found that the 63 Corvette tooth count with the t10D trans case is different as the t10C case is different than the D case. the part number listed as 3813379 is 63 corvette. the C case is 3813378 which must be pass car C/R cluster gear?????

[Edward J.]

Re: Question 63 close ratio tooth count

if anyone else along with Chris can shed some light on the tooth count(s) please weight in. Thanks Ed

[Ray K.]

Re: Question 63 close ratio tooth count

My books list B / W main drive gear 2.20 close ratio as 27 tooth count for 1963 # 3855734
cluster gear count is 28-23-19-17 for 2.20 ratio # 9771378 ( old number #3817378 )
#3817379 cluster gear is 2.54 ratio - 30-23-19-17

Ray

[Timothy B.]

Re: Question 63 close ratio tooth count

if anyone else along with Chris can shed some light on the tooth count(s) please weight in. Thanks Ed

I always thought the tooth count was different on the cluster gear on the D case because the second gear on the D case mainshaft D had a different tooth count.

[Edward J.]

Re: Question 63 close ratio tooth count

Tim, I have been doing a lot of searching on TDB archives as it looks like the input and cluster gear is what I need to convert my wide ratio to a close ratio, it also appears as though the other gears are the same.

[Duke W.]

Re: Question 63 close ratio tooth count

That's the expedient GM used to create the two ratio sets. Only two parts are different, the clutch gear and countergear. Unfortunately it results in 1-2 and 2-3 being fairly close (same intergear ratio for both CR and WR versions), and then there's a huge gap to forth.

It should be the other way around - the widest gap between 1-2, the progressively closer as you move of the gears.

The Richmond Super T-10 is what I call a progressive ratio transmission with a choice of three gear sets, with first gears of 2.88, 2.64, or 2.43. The widest gap is between 1-2 and gets closer through the gears.

Duke