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ok but the stock units are unavailable anywhere as they are obsolete and my 74 currently has a th400. Ive been searching for months now.. hence my problem.. if anyone has one they could sell me that would be great. I had one lined up but it was lost so the sale fell through.
I may have one in the spare parts pile of my old GM stuff. I'll look and see. No promises
Are we saying a 1330 with straps is not being produced? Was there one from the factory?
Look like GM part number for 76-79 turbo 350 trannys (M38) is 376747? But when I find those they do NOT have straps?
Are we saying a 1330 with straps is not being produced? Was there one from the factory?
Look like GM part number for 76-79 turbo 350 trannys (M38) is 376747? But when I find those they do NOT have straps?
Correct, I'm saying the slip yokes used on the mid-later c3s with the straps that were used for a th350 are no longer being made according to many threads here and websites like Dennys drive trains in The link above.
Kidster
Just cut it. The yoke I used on my Richmond 6 speed (Turbo 400 slip yoke 3930827) was uncomfortably long so I just cut it, smoothed it, and it's been in there for years.
NOW--- the big question: Where did you find a "Spicer 2-3-7091x" slip yoke with straps and all???
Originally Posted by Kidster
I’m getting down to the nitty gritty on my 1971 build and have to re-tackle this same issue for my 700R4 conversion from TH400 on my 1971.
Here is my findings…
My driveshaft has 1330 u-joints on both ends. I found a TH350 27 spline strap type 1330 u-joint driveshaft Slip Yoke – Spicer 2-3-7091X (Stamped on the Yoke).
The yoke is 5-11/16" approximate overall length (Center of U-joint to end of spline) so that looks to be ~6.75” end to end.
The Spicer 2-3-7091X just seems to be too long and when you push it in and bottom it out on the trans, it still shows ~1” of polished area. When you give it another 3/4” for play that you need to be able to remove the driveshaft, it becomes quite long and the u-joint part of the yoke starts to interfere with the body tunnel where the tunnel narrows on the right (Passenger) side.
I'm thinking of cutting down the yoke and that should give me the tunnel room... Subscribing to this thread to hear input on your scenario…
Kidster
Just cut it. The yoke I used on my Richmond 6 speed (Turbo 400 slip yoke 3930827) was uncomfortably long so I just cut it, smoothed it, and it's been in there for years.
NOW--- the big question: Where did you find a "Spicer 2-3-7091x" slip yoke with straps and all???
Hey @carriljc, I was targeting the "Spicer 2-3-7091x" slip yoke for its 27 spline, straps and 1330 u-joint to match the 1330 at the diff end. One showed up on Fleebay after a couple of of months of searching so I bought it. It was $100 but it was exactly what I wanted.
Thanks for the advice, I've decided that I will cut it ~1".
It will then clear the trans body tunnel.
Cheers,
Richard
Last edited by Kidster71; Jun 7, 2021 at 08:18 PM.
Hey @carriljc, I was targeting the "Spicer 2-3-7091x" slip yoke for its 27 spline, straps and 1330 u-joint to match the 1330 at the diff end. One showed up on Fleebay after a couple of of months of searching so I bought it. It was $100 but it was exactly what I wanted.
Thanks for the advice, I've decided that I will cut it ~1".
It will then clear the trans body tunnel.
Cheers,
Richard
lol you may have bought the one I was watching a couple months back... didnt buy it because the transmission wasnt a sure thing then.
Last edited by augiedoggy; Jun 7, 2021 at 10:06 PM.
I am purchasing the correct 1330 size corvette yoke from the facebook seller mentioned above.Payment already sent.
I just watched an eposide of the show were the traveling crew comes to peoples homes and finishes their projects and they talked about having to enlarge the space around the driveline on a 63 they were doing because of oversized replacement ujoints.. I would just rather not introduce that possible variable.
Last edited by augiedoggy; Jun 9, 2021 at 09:50 AM.
Really? I installed a Turbo 400 slip yoke 3930827 (which is fairly large) into my 68 with a conversion U-joint for my Richmond tranny and I did NOT have to enlarge the space. Maybe a 63's tunnel is more narrow?
Originally Posted by augiedoggy
I am purchasing the correct 1330 size corvette yoke from the facebook seller mentioned above.Payment already sent.
I just watched an eposide of the show were the traveling crew comes to peoples homes and finishes their projects and they talked about having to enlarge the space around the driveline on a 63 they were doing because of oversized replacement ujoints.. I would just rather not introduce that possible variable.
Really? I installed a Turbo 400 slip yoke 3930827 (which is fairly large) into my 68 with a conversion U-joint for my Richmond tranny and I did NOT have to enlarge the space. Maybe a 63's tunnel is more narrow?
my th400 yoke on my car now uses the 1330 sized u joint (at least thats what I've read) .. 1350 is larger/wider. And the 1310 is smaller.
Last edited by augiedoggy; Jun 9, 2021 at 12:42 PM.
Can someone provide a length measurement on the stock THM-350 slip yoke?
Is the Muncie M-21 Slip Yoke LONGER than the late 70s THM-350 slip yoke?
My M-21 slip yoke which is ~5 9/16" from flat surface (about middle of u-joint) to yoke end
My Muncie M-21 Slip Yoke fits into the 200-4R I am installing but there is no wiggle room at all. I am willing to cut it but now I am curious what the length of the THM-350 slip yoke was so I can approximate that.
I am installing a 200-4R and my 1968 Muncie-21 slip yoke goes right into the 200-4R, but it doesn't leave any wiggle room for expansion. Was the Manual Tranny slip yoke longer than the THM-350 slip yoke? I can lop off 5/16" to 3/8" from my slip yoke easy enough, but I'm now wondering if the THM-350 (later in the 70s C-3s) slip yoke was actually shorter than my M-21 slip yoke?
Attached is a picture of my M-21 slip yoke which is 5 9/16" from flat surface (about middle of u-joint) to yoke end.
Last edited by carriljc; Jan 25, 2022 at 11:13 AM.
Kidster71
It is a 1310 U-joint. Stock from my 327/350 L79 and Muncie M-21.
Do you have a stock late 70s THM-350 output yoke to compare? I'm going to have to cut this so I was hoping to get a length from a stock 350 yoke instead of guessing.
Many thanks. Looks like the "slip" distance on mine is longer than the stock THM-350. The "slip length" (which is what I really should have asked for) for my M-21 slip yoke is 3 15/16"..... makes sense. I was thinking about lopping off 5/16" to 3/8" to give it a little room for expansion. Now I feel more comfy.
Kidster71
..and other Folks,
Ok, I trimmed the GROUND HUB LENGTH on my M-21 yoke to 3 & 19/32" ground hub length.(which is 1/32" less than 3 5/8"which was reported by Kidster71 ).
I did a pre-installation check into the 200-4R and it looks like I will have about 1/4" of free play to seating against the inside of the tranny once I hook up the U-joint.
I recognize that the differential and tranny are both essentially stationary but if I need to trim more off now would be the time to do it.
Is that sufficient free play for heat expansion and whatnot?? I really don't know how much is sufficient
Last edited by carriljc; Apr 11, 2022 at 10:54 PM.
Pending further responses I ground down the barrel length to 3 17/32".... Which is less than a report I got of the Corvette Turbo 350 barrel length being 3 5/8".
