Trans - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71 gmc sled · 11-10-2005, 02:30 PM

I have a 71 gmc long bed n i just got a turbo 350 trans w/ **** kit ect. My truck came w/ a 3 speed on the tree do i have to change the crossmember to an auto one or can keep this one im puting in a 350 . If anyone could tell me any probs im going to run into w/ the motor n trans just let me know. Also let me know what u guys did w/ ur drive shafts .. thanks alot

Z28Owner · 11-10-2005, 07:24 PM

Your driveshaft should work long as your th350 is a 6 inch tailshaft, you will have to remove the manual crossmember. Which is the hardest part of the whole swap I thought. I took a sawzaw and cut bothside as close to frame as I could. You will ne an auto tranny radiator and steering column unless u use a floor shifter.

cableguy0 · 11-10-2005, 08:05 PM

the crossmember has to go no way around it. you will need an auto crossmember. a flexplate for an auto trans. also will need a shifter. dont have to swap the radiator. you can just get an external trans cooler which will work better than the radiator anyhow

Tx Firefighter · 11-11-2005, 05:02 PM

You'll also need a starter too if your truck still has the original style one on it. The original standard trans trucks used a starter with cast iron nose cone which bolts to the bellhousing with three bolts, rather than to the block like auto trucks and all later model trucks used.

71 gmc sled · 11-15-2005, 10:29 AM

thanks alot u guys helped me out alot. I'll have to post more questions!
thanks again

11-10-2005, 02:30 PM	#1
71 gmc sled Registered User Join Date: Aug 2005 Location: new jersey Posts: 14	Trans I have a 71 gmc long bed n i just got a turbo 350 trans w/ **** kit ect. My truck came w/ a 3 speed on the tree do i have to change the crossmember to an auto one or can keep this one im puting in a 350 . If anyone could tell me any probs im going to run into w/ the motor n trans just let me know. Also let me know what u guys did w/ ur drive shafts .. thanks alot

11-10-2005, 07:24 PM	#2
Z28Owner ......................... Join Date: Nov 2001 Location: benton, ky Posts: 285	Re: Trans Your driveshaft should work long as your th350 is a 6 inch tailshaft, you will have to remove the manual crossmember. Which is the hardest part of the whole swap I thought. I took a sawzaw and cut bothside as close to frame as I could. You will ne an auto tranny radiator and steering column unless u use a floor shifter. __________________ 1971 LWB Chevy C-10 350/350 3:42 eaton

11-10-2005, 08:05 PM	#3
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: Trans the crossmember has to go no way around it. you will need an auto crossmember. a flexplate for an auto trans. also will need a shifter. dont have to swap the radiator. you can just get an external trans cooler which will work better than the radiator anyhow __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

11-11-2005, 05:02 PM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Trans You'll also need a starter too if your truck still has the original style one on it. The original standard trans trucks used a starter with cast iron nose cone which bolts to the bellhousing with three bolts, rather than to the block like auto trucks and all later model trucks used. __________________ I'm on the Instagram- @Gearhead_Kevin

11-15-2005, 10:29 AM	#5
71 gmc sled Registered User Join Date: Aug 2005 Location: new jersey Posts: 14	Re: Trans thanks alot u guys helped me out alot. I'll have to post more questions! thanks again

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