Tranny swap questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ol'blue72 · 04-02-2006, 04:45 AM

I'm thinking of swapping the th350 in my 72 for a o/d tranny in the future. What is the best choice for a swap? what model and what years,etc..?

krue · 04-02-2006, 05:39 AM

200R4 is as close to a bolt in replacement as you'll find.

speedracer · 04-02-2006, 12:26 PM

yeah you just have to slide the crossmember back the holes should already be there

**VetteVet** · 04-02-2006, 02:20 PM

Just type 2004r in the search box at the top of the page your post is on and click go. Then after you've read about a hundred posts go back and type 700r4 in the same box and you can read a bunch more.

1972CheyenneSuper · 04-02-2006, 02:36 PM

I plan on putting a 4l60 in my truck. It is slightly longer than the current TH400 in it, but I'll get it mounted up. I'm not sure about the relation between the 350 and 400, but I have an article about swapping a TH400 for a 4l60. http://superchevy.com/technical/engi...9sc_overdrive/

Tim240Z · 04-02-2006, 03:19 PM

I have swapped in an L31 (5.7 Vortec from 99 Burb) and 4L60E. The trans bolted in after moving the Xmember to the back holes in the chassis, so basically a bolt in affair....
Tim

**VetteVet** · 04-02-2006, 03:31 PM

Quote:

Originally Posted by Tim240Z

I have swapped in an L31 (5.7 Vortec from 99 Burb) and 4L60E. The trans bolted in after moving the Xmember to the back holes in the chassis, so basically a bolt in affair....
Tim

How are you going to control the shifting? they are electronically controlled by the computers In the 93 and up vehicles.

BLACK AND BLUE 67-72 · 04-02-2006, 03:42 PM

Here's some to look at they build excellent transmissions, that are almost bulletproof. www.hughesperformance.com

Tim240Z · 04-02-2006, 04:26 PM

Quote:

Originally Posted by VetteVet

How are you going to control the shifting? they are electronically controlled by the computers In the 93 and up vehicles.

I swapped in the engine and trans (L31 from '99 Burb, like I mention above). I am using the OEM PCM from the Suburban also, so the tranny is being controlled by factory systems. Of course I have reprogrammed (TunerCat) to remove torque management etc....
I have put on about 2000 miles on the conversion so far. I have had to replace the tranny (Damn weak a$$ POS 4L60s) already (the donor had 70k miles on it). Other than that the truck runs beautifully.
Tim

**VetteVet** · 04-02-2006, 04:37 PM

Quote:

Originally Posted by Tim240Z

I swapped in the engine and trans (L31 from '99 Burb, like I mention above). I am using the OEM PCM from the Suburban also, so the tranny is being controlled by factory systems. Of course I have reprogrammed (TunerCat) to remove torque management etc....
I have put on about 2000 miles on the conversion so far. I have had to replace the tranny (Damn weak a$$ POS 4L60s) already (the donor had 70k miles on it). Other than that the truck runs beautifully.
Tim

OK I didn't see that you had completed the swap and had 2000 miles on it. I feel for you on the tranny but if you want to go with a rebuilt one there are plenty of upgrade options. Are you towing? Are you running a cooler for the transmission?

Tim240Z · 04-02-2006, 04:50 PM

I bought a remanufactured tranny from Monster Transmissions in Florida. It has some upgrades in it
http://racetransmissions.com/store/p...roducts_id/188
I don't tow much. Every once in a while, and every once in a while I will load the bed, but generally just driving around.
I got the tranny for $1100 including new TC and shipping. I figured it was worth a shot. I don't know if the original tranny was maybe hurt in the accident that the donor was in, but after about 500 miles into the conversion it started howling and searching for gear when in OD. Hopefully this new one will last another 80-100k miles. So far it seems to be very nice. Very firm 1-2 shift.
I run a large cooler in front of the radiator. It is the largest RV one I could find.

I have since remounted it so it looks a good deal neater. With the 245/75-16 tires and the 4.11:1 rear, I cruise at about 2100 at 75 MPH. I am thinking about putting in a 3:5x:1 to pull the rpms down even more.

Tim

bluec10 · 04-03-2006, 12:15 AM

I'm impressed with those numbers. Does it downshift a lot for passing/hills?

Ol'blue72 · 04-03-2006, 11:58 PM

so a 200r4 or 700r4 is a easy swap. what years and models w/o having to mess with any electrical/electronics issues?

**VetteVet** · 04-04-2006, 12:53 AM

Here's a good place to look.
http://www.bowtieoverdrives.com/index.shtml

Ol'blue72 · 04-04-2006, 01:58 AM

thanks vettevet thats a good site

04-02-2006, 04:45 AM	#1
Ol'blue72 Registered User Join Date: Jan 2006 Location: Berry,Al Posts: 52	Tranny swap questions I'm thinking of swapping the th350 in my 72 for a o/d tranny in the future. What is the best choice for a swap? what model and what years,etc..? __________________ '72 chevy swb '71 chevy lwb (spare) Any day above dirt is a good 'un FRIENDS HELP YOU MOVE, GOOD FRIENDS HELP YOU MOVE BODIES

04-02-2006, 05:39 AM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Tranny swap questions 200R4 is as close to a bolt in replacement as you'll find. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

04-02-2006, 12:26 PM	#3
speedracer Blank Join Date: May 2005 Location: Southington, CT Posts: 221	Re: Tranny swap questions yeah you just have to slide the crossmember back the holes should already be there __________________ 1969 lwb 4/6 drop 17x8-18x10 torque thrust II's 327-420hp 2004R 3.73 posi. 1977 Corvette 350-375hp 4speed, silver show car. 2002 S10 xtreme, work truck 2004.5 VW jetta GLI 1.8T 6speed, weekend warrior. 2013 Audi A3 TDI, the wife's car

04-02-2006, 02:20 PM	#4
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: Tranny swap questions Just type 2004r in the search box at the top of the page your post is on and click go. Then after you've read about a hundred posts go back and type 700r4 in the same box and you can read a bunch more. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

04-02-2006, 02:36 PM	#5
1972CheyenneSuper Registered User Join Date: Feb 2006 Location: ND Posts: 229	Re: Tranny swap questions I plan on putting a 4l60 in my truck. It is slightly longer than the current TH400 in it, but I'll get it mounted up. I'm not sure about the relation between the 350 and 400, but I have an article about swapping a TH400 for a 4l60. http://superchevy.com/technical/engi...9sc_overdrive/

04-02-2006, 03:19 PM	#6
Tim240Z Senior Member Join Date: Jan 2005 Location: LAX area, So Cal Posts: 499	Re: Tranny swap questions I have swapped in an L31 (5.7 Vortec from 99 Burb) and 4L60E. The trans bolted in after moving the Xmember to the back holes in the chassis, so basically a bolt in affair.... Tim __________________ 1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005)

04-02-2006, 03:42 PM	#8
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: Tranny swap questions Here's some to look at they build excellent transmissions, that are almost bulletproof. www.hughesperformance.com __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

04-02-2006, 04:50 PM	#11
Tim240Z Senior Member Join Date: Jan 2005 Location: LAX area, So Cal Posts: 499	Re: Tranny swap questions I bought a remanufactured tranny from Monster Transmissions in Florida. It has some upgrades in it http://racetransmissions.com/store/p...roducts_id/188 I don't tow much. Every once in a while, and every once in a while I will load the bed, but generally just driving around. I got the tranny for $1100 including new TC and shipping. I figured it was worth a shot. I don't know if the original tranny was maybe hurt in the accident that the donor was in, but after about 500 miles into the conversion it started howling and searching for gear when in OD. Hopefully this new one will last another 80-100k miles. So far it seems to be very nice. Very firm 1-2 shift. I run a large cooler in front of the radiator. It is the largest RV one I could find. I have since remounted it so it looks a good deal neater. With the 245/75-16 tires and the 4.11:1 rear, I cruise at about 2100 at 75 MPH. I am thinking about putting in a 3:5x:1 to pull the rpms down even more. Tim __________________ 1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005)

04-03-2006, 12:15 AM	#12
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	Re: Tranny swap questions I'm impressed with those numbers. Does it downshift a lot for passing/hills? __________________ 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.

04-03-2006, 11:58 PM	#13
Ol'blue72 Registered User Join Date: Jan 2006 Location: Berry,Al Posts: 52	Re: Tranny swap questions so a 200r4 or 700r4 is a easy swap. what years and models w/o having to mess with any electrical/electronics issues? __________________ '72 chevy swb '71 chevy lwb (spare) Any day above dirt is a good 'un FRIENDS HELP YOU MOVE, GOOD FRIENDS HELP YOU MOVE BODIES

04-04-2006, 12:53 AM	#14
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: Tranny swap questions Here's a good place to look. http://www.bowtieoverdrives.com/index.shtml __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

04-04-2006, 01:58 AM	#15
Ol'blue72 Registered User Join Date: Jan 2006 Location: Berry,Al Posts: 52	Re: Tranny swap questions thanks vettevet thats a good site __________________ '72 chevy swb '71 chevy lwb (spare) Any day above dirt is a good 'un FRIENDS HELP YOU MOVE, GOOD FRIENDS HELP YOU MOVE BODIES

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