TH350 -> 700R Swap...how hard? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TIMSPEED · 04-01-2003, 06:22 PM

I can unbolt and pull my TH350 in probably about an hour..what modifications would I need to do, in order to swap in a 700R? Thanks!
Dave?

Ol' Grey · 04-01-2003, 06:32 PM

There was a good article in Car Craft that has the specs on the GM trannies. I forget which issue it was though

AFAIK, they are splined the same, but I'm not sure on the lengths and mounting.

Ol' Grey · 04-01-2003, 06:38 PM

I found a good link for ya

http://home.hiwaay.net/~ppatter/transmission_swaps.html

Here's one...sort of...it's the reverse of what you want

http://www.oldengine.org/unfaq/leadfoot/th350in.htm

*1FaastC10* · 04-01-2003, 09:26 PM

In Response To:
"TH350 -> 700R Swap...how hard? "

TH350 -> 700R4 = GRAVY

move your crossmember back 1 1/4" and bolt it all together.

79BIG10 · 04-02-2003, 12:24 AM

Also make sure to add a extra tranny cooler and set the TV cable correctly.

TIMSPEED · 04-02-2003, 02:10 AM

How about for the shift linkage in the column? Would I have to get a column outta a 700R4 truck?

79BIG10 · 04-02-2003, 03:32 AM

No the only difference is that you may need to adjust the shifter linkage at the base of the long rod that connects the column arm to the tranny connection. When we did the swap on a buddy's he couldn't get into 1st gear with the shifter. I loosened the rod enough to let him shift down then retightened. Fixed easily.

LOHRTBT · 04-02-2003, 10:30 AM

just go to a yard for the label that has (D) on it. That is all I did.

TIMSPEED · 04-02-2003, 12:54 PM

Coolio! I may be doing this swap sooner than expected, because I want this truck to be my 100% only driver (right now, it's only around town, because of having no overdrive.)

Lead65sled · 04-02-2003, 01:06 PM

This is great information. I am thinking about the locking torque converter though. What do we do about that? We don't have a computer on board .... hmm?

TIMSPEED · 04-02-2003, 01:10 PM

I think B&M makes a kit for that lock-up...

Slonaker · 04-02-2003, 01:24 PM

This (from Swervin's site) might answer the lockup question...

http://www.73-87.com/garage/lockup.htm

Slonaker

*1FaastC10* · 04-02-2003, 03:41 PM

the computer isnt lockup controlled on a 700R4 or a 4L60 (later 700R4) a 4L60E however is entirely computer controlled, and does require a computer.

*1FaastC10* · 04-02-2003, 03:42 PM

scratch that, the LOCKUP isnt COMPUTER controlled....

04-01-2003, 06:22 PM	#1
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	TH350 -> 700R Swap...how hard? I can unbolt and pull my TH350 in probably about an hour..what modifications would I need to do, in order to swap in a 700R? Thanks! Dave? __________________ I have a few cars... See Them Here

04-01-2003, 06:32 PM	#2
Ol' Grey A work in progress Join Date: Mar 2003 Location: Marion, NC Posts: 104	There was a good article in Car Craft that has the specs on the GM trannies. I forget which issue it was though AFAIK, they are splined the same, but I'm not sure on the lengths and mounting. __________________ Marc Cook 1986 Chevy Silverado C-10 LWB Gunmetal Grey Metallic 5.0L HO, 700-R4, '73 12-bolt rear Long tube headers, 2.5" dual exhaust dumped before the axle. 1988 GMC Sierra SLE 4WD 5.7L, 700-R4, stock everything 6000LB winch

04-02-2003, 12:24 AM	#5
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	Also make sure to add a extra tranny cooler and set the TV cable correctly. __________________ 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

04-02-2003, 02:10 AM	#6
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	How about for the shift linkage in the column? Would I have to get a column outta a 700R4 truck? __________________ I have a few cars... See Them Here

04-02-2003, 03:32 AM	#7
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	No the only difference is that you may need to adjust the shifter linkage at the base of the long rod that connects the column arm to the tranny connection. When we did the swap on a buddy's he couldn't get into 1st gear with the shifter. I loosened the rod enough to let him shift down then retightened. Fixed easily. __________________ 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

04-01-2003, 06:38 PM	#3
Ol' Grey A work in progress Join Date: Mar 2003 Location: Marion, NC Posts: 104	I found a good link for ya http://home.hiwaay.net/~ppatter/transmission_swaps.html Here's one...sort of...it's the reverse of what you want http://www.oldengine.org/unfaq/leadfoot/th350in.htm

04-01-2003, 09:26 PM	#4
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	In Response To: "TH350 -> 700R Swap...how hard? " TH350 -> 700R4 = GRAVY move your crossmember back 1 1/4" and bolt it all together.

04-02-2003, 10:30 AM	#8
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	just go to a yard for the label that has (D) on it. That is all I did. __________________ ~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - *1986 Chevy Custom SWB* *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods www.cardomain.com/id/ramairdave AIM Screenname - Jester84

04-02-2003, 12:54 PM	#9
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	Coolio! I may be doing this swap sooner than expected, because I want this truck to be my 100% only driver (right now, it's only around town, because of having no overdrive.) __________________ I have a few cars... See Them Here

04-02-2003, 01:06 PM	#10
Lead65sled Registered User Join Date: Apr 2003 Location: Roy, Utah Posts: 6	700R4 conversion - what about the lockup? This is great information. I am thinking about the locking torque converter though. What do we do about that? We don't have a computer on board .... hmm? __________________ The only rule is, "Keep it between the lines and shiny side up."

04-02-2003, 01:10 PM	#11
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	I think B&M makes a kit for that lock-up... __________________ I have a few cars... See Them Here

04-02-2003, 01:24 PM	#12
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	This (from Swervin's site) might answer the lockup question... http://www.73-87.com/garage/lockup.htm Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

04-02-2003, 03:41 PM	#13
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	the computer isnt lockup controlled on a 700R4 or a 4L60 (later 700R4) a 4L60E however is entirely computer controlled, and does require a computer.

04-02-2003, 03:42 PM	#14
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	scratch that, the LOCKUP isnt COMPUTER controlled....



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