Transmission swap? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70chevy · 07-29-2002, 12:48 PM

I have 70 1/2 which had a TH350. When swaping to the 700R4 will there be any clearance problems with the cab?

Low69CST · 07-29-2002, 12:50 PM

You have a high or low hump cab?

70chevy · 07-29-2002, 01:02 PM

How can u tell which hump is low or high?

Chevyc10! · 07-29-2002, 01:34 PM

If you haven't seen one then, well ...
If the truck is a 4x4 or a Big block then it should have the high hump. All others are low hump

bigvinnie · 07-29-2002, 02:27 PM

mines'a low hump with a 350 mounted in the front set of frame holes.... no clearance problems with the 700...

crazy longhorn · 07-29-2002, 02:45 PM

My longhorn was a 350/with 400 turbo & a low hump,no problems. If you are mounted in 6 cyl position(stands), it might be tight.........Al

70chevy · 07-29-2002, 04:09 PM

Thanks for the info. The truck is 2 wheel. I just bought a 700 and wanted to make sure since it will be a while for the cab will be put back on.

Low69CST · 07-29-2002, 04:20 PM

I had a cab off a 68 truck on my 69 frame while I had my 700 installed. There was a really slight clearance problem with one lip that protruded from the cab. It was in the trans-hump area. The rub was so slight that it may have just been limited to my cab being stamped odd. But now I have a 69 cab with a big hump. Zero problems.

Longhorn Man · 07-29-2002, 06:09 PM

The 4 speed trucks had high humps, and aperantly (although not documented) the V-6/TH400 GMCs had high humps too.

1-PU70 · 07-29-2002, 08:45 PM

I have a 402 and a 700R4 in a 70 low hump and theres plenty of room. If you have a clereance problem you might want to check your cab mounts.

Denny · 07-29-2002, 10:10 PM

My low hump cab with 700R tranny has plenty of room also.

Ed ke6bnl · 07-30-2002, 02:58 AM

Quote:

Originally posted by crazy longhorn
My longhorn was a 350/with 400 turbo & a low hump,no problems. If you are mounted in 6 cyl position(stands), it might be tight.........Al

Our truck has the engine mounted in the 6 mount holes, how much trouble will this cause. Ed ke6 so.Calif.

crazy longhorn · 07-30-2002, 10:20 AM

Mounted in 6/250 position, you may have to cut the lip off the bottom of the cab(across the trans tunnel). i think the rest will clear,but will be tight. My 69 also has a body drop, so it needed the trans tunnel reworked.Good luck.....Al

Low69CST · 07-30-2002, 10:59 AM

I had the same problem as crazylonghorn, but my truck was a 307 originally

Hutch · 07-30-2002, 01:25 PM

check out this article on converting a low hump floor to high hump.
It might save you some clearence problems in the future and what the heck while you got it apart.

http://www.earlyclassic.com/68rodsto...ec2000pg6.html

69DISASTER · 04-02-2009, 10:22 PM

Can anybody tell me if the high hump trucks were factory big blocks? And another question, which tranny is a better swap the 700r4 or the NV4500?

Longhorn Man · 04-02-2009, 10:51 PM

this is the second 7 YEAR OLD THREAD to pop up this week!

High humps came in;
all 4X4 trucks
All 4 speed trucks
All big blocks that had a 4 speed or automatic.

As for the tranny question, the 4500 is probably stronger, but the 700 can be built stronger, the 700 can be installed with less work, and possibly cheaper.

bmrrwolfe · 04-09-2009, 05:42 PM

i just got a 700r4, and origianlly had the 3 speed, i cut out the old tranny crossmember and got a new one from CPP, but am now unsure where i mount it, since i have the motor out being rebuilt.
anyone have any pictures?
Thanks!

69DISASTER · 04-10-2009, 10:07 PM

I really want to stay with a standard. 5 speed would be great for the rpms, and no patching the floor.

07-29-2002, 12:48 PM	#1
70chevy Registered User Join Date: Aug 2001 Location: Cherryville, NC Posts: 147	Transmission swap? I have 70 1/2 which had a TH350. When swaping to the 700R4 will there be any clearance problems with the cab? __________________ Ken Smith 99 C5 Torch Red Coupe 85 Chevy Candy Apple 70 Chevy 1/2 in process.Semi-gloss black powdercoated frame & suspension, disc brakes up front, 3" drop spindle(Beltech) 5 lug 3.73 rearend, ZZ4, Sanderson headers, 700R4, Air Ride system, Summitt 16 gal fuel cell, Holly mech. fuel pump,

07-29-2002, 12:50 PM	#2
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	You have a high or low hump cab? __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

07-29-2002, 01:02 PM	#3
70chevy Registered User Join Date: Aug 2001 Location: Cherryville, NC Posts: 147	How can u tell which hump is low or high? __________________ Ken Smith 99 C5 Torch Red Coupe 85 Chevy Candy Apple 70 Chevy 1/2 in process.Semi-gloss black powdercoated frame & suspension, disc brakes up front, 3" drop spindle(Beltech) 5 lug 3.73 rearend, ZZ4, Sanderson headers, 700R4, Air Ride system, Summitt 16 gal fuel cell, Holly mech. fuel pump,

07-29-2002, 01:34 PM	#4
Chevyc10! Registered User Join Date: Dec 2000 Location: Centerville Ga. USA Posts: 804	If you haven't seen one then, well ... If the truck is a 4x4 or a Big block then it should have the high hump. All others are low hump __________________ 68 SWB The Surgeon General doesn't say anything about smoking a Ford!!! Would rather be ran over repeatedly by a Chevy than drive a Ford!!! Paralyzed from the neck up and confined to a hat! Kathleen, Georgia USA

07-29-2002, 02:27 PM	#5
bigvinnie Registered User Join Date: Aug 2001 Location: escondido, ca 92026 Posts: 1,222	mines'a low hump with a 350 mounted in the front set of frame holes.... no clearance problems with the 700... __________________ '72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA 72 Stepside Project

07-29-2002, 02:45 PM	#6
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	My longhorn was a 350/with 400 turbo & a low hump,no problems. If you are mounted in 6 cyl position(stands), it might be tight.........Al

07-29-2002, 04:09 PM	#7
70chevy Registered User Join Date: Aug 2001 Location: Cherryville, NC Posts: 147	Thanks for the info. The truck is 2 wheel. I just bought a 700 and wanted to make sure since it will be a while for the cab will be put back on. __________________ Ken Smith 99 C5 Torch Red Coupe 85 Chevy Candy Apple 70 Chevy 1/2 in process.Semi-gloss black powdercoated frame & suspension, disc brakes up front, 3" drop spindle(Beltech) 5 lug 3.73 rearend, ZZ4, Sanderson headers, 700R4, Air Ride system, Summitt 16 gal fuel cell, Holly mech. fuel pump,

07-29-2002, 04:20 PM	#8
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	I had a cab off a 68 truck on my 69 frame while I had my 700 installed. There was a really slight clearance problem with one lip that protruded from the cab. It was in the trans-hump area. The rub was so slight that it may have just been limited to my cab being stamped odd. But now I have a 69 cab with a big hump. Zero problems. __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

07-29-2002, 06:09 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	The 4 speed trucks had high humps, and aperantly (although not documented) the V-6/TH400 GMCs had high humps too.

07-29-2002, 08:45 PM	#10
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	I have a 402 and a 700R4 in a 70 low hump and theres plenty of room. If you have a clereance problem you might want to check your cab mounts. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

07-29-2002, 10:10 PM	#11
Denny Registered User Join Date: Jul 2002 Location: Cedar Hill, MO Posts: 426	My low hump cab with 700R tranny has plenty of room also. __________________ 1969 Chevy C10. Dakota Digital Gauges, 383 Votex Engine, MSD 8361 Distributor, MSD 6A Unit, Demon Carb, Phoenix Transmission 4L80E trans, 3:73 Posi Rear End Early Classics 6 Lug Disc Brakes and Spindles All Stainless Lines

07-30-2002, 10:20 AM	#13
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Mounted in 6/250 position, you may have to cut the lip off the bottom of the cab(across the trans tunnel). i think the rest will clear,but will be tight. My 69 also has a body drop, so it needed the trans tunnel reworked.Good luck.....Al

07-30-2002, 10:59 AM	#14
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	I had the same problem as crazylonghorn, but my truck was a 307 originally __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

07-30-2002, 01:25 PM	#15
Hutch Registered User Join Date: Oct 2001 Location: Grapevine, Tx. Posts: 2,142	check out this article on converting a low hump floor to high hump. It might save you some clearence problems in the future and what the heck while you got it apart. http://www.earlyclassic.com/68rodsto...ec2000pg6.html __________________ John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS

04-02-2009, 10:22 PM	#16
69DISASTER Registered User Join Date: Oct 2008 Location: CALGARY, ALBERTA Posts: 62	Re: Transmission swap? Can anybody tell me if the high hump trucks were factory big blocks? And another question, which tranny is a better swap the 700r4 or the NV4500?



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04-02-2009, 10:51 PM	#17
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Transmission swap? this is the second 7 YEAR OLD THREAD to pop up this week! High humps came in; all 4X4 trucks All 4 speed trucks All big blocks that had a 4 speed or automatic. As for the tranny question, the 4500 is probably stronger, but the 700 can be built stronger, the 700 can be installed with less work, and possibly cheaper.

04-09-2009, 05:42 PM	#18
bmrrwolfe 1970 C10 Join Date: Dec 2007 Location: Cleveland Ohio Posts: 212	Re: Transmission swap? i just got a 700r4, and origianlly had the 3 speed, i cut out the old tranny crossmember and got a new one from CPP, but am now unsure where i mount it, since i have the motor out being rebuilt. anyone have any pictures? Thanks!

04-10-2009, 10:07 PM	#19
69DISASTER Registered User Join Date: Oct 2008 Location: CALGARY, ALBERTA Posts: 62	Re: Transmission swap? I really want to stay with a standard. 5 speed would be great for the rpms, and no patching the floor.

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