T10-1C question

[Donald H.]

I have a T10-1C that I bought to replace a T10-1D that came on my 1960 project car.

I was told by a BW trans expert that if the input shaft had a notch in the teeth that is would indicate a wide ratio transmission.

Can anyone confirm this?

I do not have the transmission apart yet, but when I do, how do I confirm that it is a wide ratio, i.e. are there part numbers on the main gear or cluster, or do I count teeth?

Thanks,

Don

[Loren L.]

Re: T10-1C question

Your 1960 should have a cast iron T10-1B main case.

[Donald H.]

Re: T10-1C question

Your 1960 should have a cast iron T10-1B main case.

Yes I know. I have a T10-1B case that I will use when I rebuild the transmission. I will end up with a near correct transmission configuration, the Main Case will be correct and with a date of August 60, the tail case is T10-7B and July 60 date. However, it will not be date correct for my 60, which was a November 59 build.

I do however, want to end up with a wide ratio transmission as I have rebuild the rear with 3.36 gears.

I just don't know how to tell if what I have is already a wide ratio, other than the notch/groove on the input shaft.

Don.

[Bill M.]

Re: T10-1C question

I just don't know how to tell if what I have is already a wide ratio, other than the notch/groove on the input shaft.

Don.

T-10 CR has a 27 tooth clutch gear; cluster is 28-23-20-17
T-10 WR has a 25 tooth clutch gear; cluster is 30-23-20-17

[Timothy B.]

Re: T10-1C question

Donald,

Put the transmission in first gear and spin the input shaft one turn and count the @ of turns at the rear output shaft.

[Donald H.]

Re: T10-1C question

Donald,

Put the transmission in first gear and spin the input shaft one turn and count the @ of turns at the rear output shaft.

Great

I did that and I am reasonable sure that it is a wide ratio. In first, the the input shaft turned 2 1/2 turns to one of the output. I assume that if it was close ration it would turn just a little past two turns (2.20 first versue 2.54 for the wide).

This will save me $200 plus since I was planning to buy the stuff to convert to wide ratio.

Thanks,
Don

[Wayne L.]

Re: T10-1C question

One "groove" around the input shaft indicates wide ratio.

[Donald H.]

T10-1C Cluster gear - what is this?

T-10 CR has a 27 tooth clutch gear; cluster is 28-23-20-17
T-10 WR has a 25 tooth clutch gear; cluster is 30-23-20-17

I have my transmission apart. The input shaft gear has 25 teeth. The Cluster is 30-23-19-17 (yes 19, I have counted a number of times) and as you can see in the attached picture, the end of the cluster gear has T10D-8 etched into it.

What is this cluster gear? Is it from a T10D? Will it work for my T10-C/B?

Thanks,
Don

[John H.]

Re: T10-1C Cluster gear - what is this?

I have my transmission apart. The input shaft gear has 25 teeth. The Cluster is 30-23-19-17 (yes 19, I have counted a number of times) and as you can see in the attached picture, the end of the cluster gear has T10D-8 etched into it.

What is this cluster gear? Is it from a T10D? Will it work for my T10-C/B?

Thanks,
Don

Don -

Colvin's Corvette By The Numbers shows the 30-23-19-17 cluster as used in '62-'63 wide-ratio T-10's.

[Donald H.]

Re: T10-1C question

I don't want to "overstay my welcome" on asking questions , but now I need to determine what I need to replace in the rebuild. I will most likely order from D&L Transmission. At a minimum I expect to order the following:

1. Rebuild kit (I don't know what this included, but can find that out from Larry at D&L)
2. Torque Lock Slider (one or both?)
3. Need to determine if I should keep this cluster or order correct 30-23-20-17 count

Since I have never done this before, I don't really know how to decide if something needs to be replaced or is serviceable.

For example, Here are two photos, one of the Reverse Gear and one of the Rear Reverse Idler Gear. There is some wear where these two mesh. Or they OK, or should they be replaced?

Thanks,

Don

[Loren L.]

Re: T10-1C Cluster gear - what is this?

Don -

Colvin's Corvette By The Numbers shows the 30-23-19-17 cluster as used in '62-'63 wide-ratio T-10's.

John, as always, is correct; my sources indicate it is also good for 1963 Full size Buick, 64-5 mid size Buick, 62-3 Chevrolet and 61-64 Pontiac.

[Tom P.]

Re: T10-1C question

Don,
Those reverse gears are excellent for re-use. I wish some of the ones that I've reused looked that good!!!
Some rounding off of the points of the reverse gears is not at all uncommon. Where there would be a concern is if any of the gear teeth had sizeable chips in them.

[Bill M.]

Re: T10-1C question

Loren:

Read your own Restorer article. From your very thorough coverage:

1962 first design: 30-23-20-17

1962 second design: 30-23-19-17

Don:

Your transmission is a wide ratio. 20 or 19 doesn't matter as long as you use the correct 2nd gear on the mainshaft. (You can't put a 30-23-20-17 in your transmission because it has a 2nd gear for a 30-23-19-17). You're good to go.

[Donald H.]

Re: T10-1C question

Ok, thanks this helps very much. Tom's comment give me much more insight into what to look for.

Last question - I have looked at the teeth on both sliders and they look pretty good, very little if any obvious wear. But from my research on this forum, and the T10 history in general, should I replace the 1st/2nd gear slider with a torque lock replacement?

What about the 3rd/4th gear slider? If it looks good, should I go ahead and replace it with a torque lock replacement?

Thanks,

Don

[Doug F.]

Re: T10-1C question

Donald, alot of the time the only way to tell if a part needs replacing is to test drive it, sometimes the old used part will work better than the replacement, as you know t-10's have a habit of not wanting to downshift and occasionally they don't want to shift up either mostly 2 nd and 3 rd, synchros and sliders help sometimes, but outer gear wear contributes, you might want to test it before you throw a bunch of money at it,