700 R4 into a '76 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bluec10 · 04-09-2005, 11:52 PM

Need a new trans for my '76. The wrecker has a replacement TH350, but he also has a 700 R4 for a good price. I know the 700 has a fussy TV cable, but other than that will the thing fit? I'm thinking of crossmember location and the number of splines on the input/output shafts. What about overall length?

79BIG10 · 04-10-2005, 02:37 AM

If the TH350 is a 9" tail then you're fine. They have very minimal difference and you can still you the same driveshaft. The splines are the same as well. You do of course have to slide it back a little and drille holes to mount the crossmember in the frame. Along with that you have to wire the torque converter as well. For that look here http://73-87.com/7387garage/drivetrain/lockup.htm

pedrofixlater · 04-10-2005, 07:20 AM

The TV cable isn't as trickt as you would think but the gromet that it hooks to on your carb is different than the th350 you can get them for 5.00 at any parts store.

bluec10 · 04-10-2005, 07:28 PM

Thanks for your advice and for the link. I'm still confused about the TV hookup. I remember reading posts about guys who have poorly adjusted TV cables on 700R4's roasting their transmissions after a few freeway miles. What is going wrong in these cases?

04-09-2005, 11:52 PM	#1
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	700 R4 into a '76 Need a new trans for my '76. The wrecker has a replacement TH350, but he also has a 700 R4 for a good price. I know the 700 has a fussy TV cable, but other than that will the thing fit? I'm thinking of crossmember location and the number of splines on the input/output shafts. What about overall length? __________________ Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said.

04-10-2005, 02:37 AM	#2
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,775	If the TH350 is a 9" tail then you're fine. They have very minimal difference and you can still you the same driveshaft. The splines are the same as well. You do of course have to slide it back a little and drille holes to mount the crossmember in the frame. Along with that you have to wire the torque converter as well. For that look here http://73-87.com/7387garage/drivetrain/lockup.htm __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

04-10-2005, 07:20 AM	#3
pedrofixlater 75 STEPSIDE Join Date: Mar 2005 Location: Suffolk, VA Posts: 92	The TV cable isn't as trickt as you would think but the gromet that it hooks to on your carb is different than the th350 you can get them for 5.00 at any parts store. __________________ Pete 75 Chevy Stepside 70 Buick Skylark/GS

04-10-2005, 07:28 PM	#4
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	Thanks for your advice and for the link. I'm still confused about the TV hookup. I remember reading posts about guys who have poorly adjusted TV cables on 700R4's roasting their transmissions after a few freeway miles. What is going wrong in these cases? __________________ Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said.



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