How to determine T-10 wide vs. close ratio tranny

[Patrick H.]

Re: How to determine T-10 wide vs. close ratio tranny

How about grooves on the input shaft?
I see either no grooves or one groove when I check out ones for sale.

No one knows offhand for a 1962 (or I suspect 1963) which is close vs wide?

My suspicion is that one groove = wide ratio based on the 1963 300hp car I worked on 2 years ago.
However, a data point of 1 is...1.

[Leif A.]

Re: How to determine T-10 wide vs. close ratio tranny

Leif- I just wanted to take the opportunity to acknowledge ALL the unselfish help you continually provide the Corvette Communities.
Your posts are usually prompt, insightful, and typically 99% correct... way better than needed, to get into the Hall of Fame.
PLEASE don't let any derogatory comment slow you down... your help is GREATLY appreciated!

Jack,
Thank you for your kind words. I enjoy helping when and where I can and I'll be to first to admit I err occasionally...guess that just makes me human. It's all good.
On the other hand, your posts never cease to amaze me with the depth and accuracy of knowledge. I know that I can speak for many on this forum, and other forums, that your wisdom is greatly appreciated.
Be well, my friend.

[Patrick H.]

Re: How to determine T-10 wide vs. close ratio tranny

Thanks to Dave Perry and Jack Morocco for the chart.

The 1 groove input shaft DOES indicate a wide ratio T-10 in a 1962 Corvette.

[Troy P.]

Re: How to determine T-10 wide vs. close ratio tranny

Thank you all for your input!

I'm going with the posts and 63-64 TIMJG information that the high HP engine options all came with the close ratio. Mine is 360 HP. With my 4.11 rear it sure turns RPM at our local 75 mph speed limits.

Back in 1970 when I was attempting to order a new Corvette I was troubling over all the engine, close or wide tranny (4 speed was a no brainer), and differential ratio options. All those choices made my head spin. Then there was a strike or rumors of a strike at the factory. I was impatient and bought a new XKE instead. Is that cause for getting banned from this forum?