eng/trans swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

poorboy · 12-10-2006, 10:49 PM

I'm going to swap the I6 and 3 speed that's in my truck for a 350/350 combo. If I put it in the sb holes in the frame can I use the same drive line?

poorboy · 12-12-2006, 01:05 AM

Maybe someone can measure there's for me?

kyull67 · 12-12-2006, 01:32 AM

If by driveline you mean the driveshaft, then I am pretty sure you can. I have a '67 shortbed stepside that came with the I6 and I converted to the 350/350 and was able to use the stock one-piece drive shaft. It may not be the case for all trucks though so hopefully someone else will add to this.

69rut · 12-12-2006, 08:10 AM

I will say yes, but I'm not 100% sure.

You will need a transmission cross member to support the turbo. If you know where that goes you could check the distance from the cross member to end of tranny VS the bellhousing mounts to end of tranny for the 3 speed. If the end of the tranny is the same for both then you are all set.

Finding a new driveshaft should not be that hard if you need one. Just visit the boneyard.

chevybill · 12-12-2006, 06:46 PM

I think if you put the engine in the v-8 forward position you will need to have the driveshaft lengthed, espcially a shortail tranny. I think you definitely need a different yolk for the automatic. Obtaining a crossmember is easy, one can be bought from any vendors here on the board.

poorboy · 12-12-2006, 09:26 PM

I have the short 3 speed in there now. That's why I was thinking I might be able to reuse the driveline. I have access to a crossmember. I guess when I get the truck home Sat I'll start measuring.

**Boog** · 12-12-2006, 09:48 PM

You will most likely find that you will need a T350 with the 9" long tail housing in order to use the stock 1 piece driveshaft. The short tail 350 requires a longer shaft.

12-10-2006, 10:49 PM	#1
poorboy Senior Member Join Date: Jun 2006 Location: Oregon City, Or Posts: 758	eng/trans swap I'm going to swap the I6 and 3 speed that's in my truck for a 350/350 combo. If I put it in the sb holes in the frame can I use the same drive line?

12-12-2006, 01:05 AM	#2
poorboy Senior Member Join Date: Jun 2006 Location: Oregon City, Or Posts: 758	Re: eng/trans swap Maybe someone can measure there's for me?

12-12-2006, 01:32 AM	#3
kyull67 Registered User Join Date: Nov 2006 Location: Springfield/Kansas City Posts: 1,842	Re: eng/trans swap If by driveline you mean the driveshaft, then I am pretty sure you can. I have a '67 shortbed stepside that came with the I6 and I converted to the 350/350 and was able to use the stock one-piece drive shaft. It may not be the case for all trucks though so hopefully someone else will add to this.

12-12-2006, 08:10 AM	#4
69rut Registered User Join Date: Sep 2006 Location: SE Virginia Posts: 158	Re: eng/trans swap I will say yes, but I'm not 100% sure. You will need a transmission cross member to support the turbo. If you know where that goes you could check the distance from the cross member to end of tranny VS the bellhousing mounts to end of tranny for the 3 speed. If the end of the tranny is the same for both then you are all set. Finding a new driveshaft should not be that hard if you need one. Just visit the boneyard. __________________ trailers are for boats

12-12-2006, 06:46 PM	#5
chevybill Senior Member Join Date: Oct 2004 Location: calhoun city ms Posts: 940	Re: eng/trans swap I think if you put the engine in the v-8 forward position you will need to have the driveshaft lengthed, espcially a shortail tranny. I think you definitely need a different yolk for the automatic. Obtaining a crossmember is easy, one can be bought from any vendors here on the board. __________________ ongoing 1970 c 10 lwb 1994 z-28 few mods.-owned since new 1978 vette silver/grey 25th anniv. paint Last edited by chevybill; 12-12-2006 at 06:47 PM.

12-12-2006, 09:26 PM	#6
poorboy Senior Member Join Date: Jun 2006 Location: Oregon City, Or Posts: 758	Re: eng/trans swap I have the short 3 speed in there now. That's why I was thinking I might be able to reuse the driveline. I have access to a crossmember. I guess when I get the truck home Sat I'll start measuring.

12-12-2006, 09:48 PM	#7
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,118	Re: eng/trans swap You will most likely find that you will need a T350 with the 9" long tail housing in order to use the stock 1 piece driveshaft. The short tail 350 requires a longer shaft. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross



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