Driveshaft interchange ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Lost in the 60's** · 09-19-2022, 03:44 PM

I have a '67 long bed roller that was a 6 cylinder/pg. The driveshaft was missing when I got it and I have a local guy selling one, but it's from a C20 with 350/4 speed. Will this driveshaft interchange with the 6/ TH350 I'm going to install ? Length is most important, I can change yokes.
Thanks
Pic of my "new" original paint work truck...

Markuli · 09-19-2022, 05:10 PM

The 4 speed shaft is going to be too long for your TH350. Even going to an M20 passenger car 4 speed, I had to cut down my driveshaft from my original SM420 truck 4 speed.

**Lost in the 60's** · 09-20-2022, 01:08 PM

OK thanks, long is better than short. I can cut it down but I can't stretch it...

**Jason Banks** · 09-20-2022, 01:54 PM

Make sure to check those U-joint sizes...

C10 rear end is 1310 ujoint, but I'm pretty sure my 4-speed in a c10 was 1350 at the trans.

C20 might be 1350 at the rear end. Hopefully someone will chime in here.

**Lost in the 60's** · 09-20-2022, 02:55 PM

That's what I was thinking too. Seems I used to buy a conversion u-joint for just this issue..Spicer, maybe ?

**Jason Banks** · 09-20-2022, 03:37 PM

Yah, the conversion joints are pretty readily available...

You might also need to make sure the replacement driveshaft has the correct carrier bearing, or you might need to carrier bearing from the other truck.

Another thing I just thought of, the diff in the C20 is going to be different than the C10 and might mean it has a different length driveshaft in the rear.

09-19-2022, 03:44 PM	#1
Lost in the 60's Senior Member Join Date: Mar 2022 Location: Twin Cites, MN Posts: 217	Driveshaft interchange ?? I have a '67 long bed roller that was a 6 cylinder/pg. The driveshaft was missing when I got it and I have a local guy selling one, but it's from a C20 with 350/4 speed. Will this driveshaft interchange with the 6/ TH350 I'm going to install ? Length is most important, I can change yokes. Thanks Pic of my "new" original paint work truck...

09-19-2022, 05:10 PM	#2
Markuli Registered User Join Date: Apr 2018 Location: Riverdale, NJ Posts: 85	Re: Driveshaft interchange ?? The 4 speed shaft is going to be too long for your TH350. Even going to an M20 passenger car 4 speed, I had to cut down my driveshaft from my original SM420 truck 4 speed.

09-20-2022, 01:08 PM	#3
Lost in the 60's Senior Member Join Date: Mar 2022 Location: Twin Cites, MN Posts: 217	Re: Driveshaft interchange ?? OK thanks, long is better than short. I can cut it down but I can't stretch it...

09-20-2022, 01:54 PM	#4
Jason Banks Senior Member Join Date: Dec 1999 Location: TX Posts: 1,626	Re: Driveshaft interchange ?? Make sure to check those U-joint sizes... C10 rear end is 1310 ujoint, but I'm pretty sure my 4-speed in a c10 was 1350 at the trans. C20 might be 1350 at the rear end. Hopefully someone will chime in here.

09-20-2022, 02:55 PM	#5
Lost in the 60's Senior Member Join Date: Mar 2022 Location: Twin Cites, MN Posts: 217	Re: Driveshaft interchange ?? That's what I was thinking too. Seems I used to buy a conversion u-joint for just this issue..Spicer, maybe ?

09-20-2022, 03:37 PM	#6
Jason Banks Senior Member Join Date: Dec 1999 Location: TX Posts: 1,626	Re: Driveshaft interchange ?? Yah, the conversion joints are pretty readily available... You might also need to make sure the replacement driveshaft has the correct carrier bearing, or you might need to carrier bearing from the other truck. Another thing I just thought of, the diff in the C20 is going to be different than the C10 and might mean it has a different length driveshaft in the rear.



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