swapping a 700r4 with a 350 transmission - The 1947 - Present Chevrolet & GMC Truck Message Board Network

salrod00 · 11-22-2008, 11:16 PM

Ok people help me please... i have a 85 SWB that i dropped a 350 TBI in. Well several months of driving it my drive and over drive went out on it. So now i dropped a 350 tranny in it. first time it leaked all the fluid from the front seal on the transmission. so now i put a new seal and i noticed that it is leaking from the converter . My question is do i use the converter that came with 350 tranny or what.. do i need to change anything else to get this thing on the road..thanks in advance

SSC's76 · 11-23-2008, 10:15 AM

Well for starters the 700r4 converter is different spline count so yeah the th350 converter is the one you need to use. The leak most likely isnt the seal or the converter but the pump bushing which requires you do replace that seal one more time but you need to take the front pump out to do it. The bushing kinda looks like a cam bearing sorta and gives the converter a surface to ride on.

salrod00 · 11-23-2008, 11:13 AM

ok so i do have the th350 converter with me already but when you say the pump bushing and taking out the front pump put. where is this at on the tranny. is it inside the fluid pan..???

11-22-2008, 11:16 PM	#1
salrod00 Registered User Join Date: Dec 2007 Location: tyler texas Posts: 165	swapping a 700r4 with a 350 transmission Ok people help me please... i have a 85 SWB that i dropped a 350 TBI in. Well several months of driving it my drive and over drive went out on it. So now i dropped a 350 tranny in it. first time it leaked all the fluid from the front seal on the transmission. so now i put a new seal and i noticed that it is leaking from the converter . My question is do i use the converter that came with 350 tranny or what.. do i need to change anything else to get this thing on the road..thanks in advance

11-23-2008, 10:15 AM	#2
SSC's76 No No Join Date: Jun 2005 Location: Pueblo Colorado Posts: 1,781	Re: swapping a 700r4 with a 350 transmission Well for starters the 700r4 converter is different spline count so yeah the th350 converter is the one you need to use. The leak most likely isnt the seal or the converter but the pump bushing which requires you do replace that seal one more time but you need to take the front pump out to do it. The bushing kinda looks like a cam bearing sorta and gives the converter a surface to ride on. __________________ 1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler

11-23-2008, 11:13 AM	#3
salrod00 Registered User Join Date: Dec 2007 Location: tyler texas Posts: 165	Re: swapping a 700r4 with a 350 transmission ok so i do have the th350 converter with me already but when you say the pump bushing and taking out the front pump put. where is this at on the tranny. is it inside the fluid pan..???

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