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tips, technology, tools and techniques related to vehicle driveline components

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88v8
Ivor Duarte
Gloucestershire UK
(472 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
TR6 74 2.5 injection six

TH350 swap for 700 or 200?
Posted by: 88v8
Date: March 28, 2017 03:13PM

This TR6 that I flagged
[forum.britishv8.org]
with the 350 SBC and, I assume, TH350 (the seller bought it as 'an investment' and doesn't know what box it has except it's 3-speed) would there be major problems converting it to a 700R4 or 200-4-R?

What I can see..... 700 is the same length as 350 but rather heavy. Mounts are the same.
200 is same length but mounts differ.

Both 200 and 700 have their fans and detractors.

If this is not a major swap, perhaps I should go look at the car.

Ivor


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5243 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: TH350 swap for 700 or 200?
Posted by: BlownMGB-V8
Date: March 28, 2017 03:51PM

My understanding is that it's almost a bolt-in swap. You have to wire it for a TCC switch but it can be fully manual.

The 700r4 is common and easy to find. The 2004r has better gear ratios for a sports car.

Jim


DiDueColpi
Fred Key
West coast - Canada
(1198 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
What if the Hokey Pokey really is what it's all about?

authors avatar
Re: TH350 swap for 700 or 200?
Posted by: DiDueColpi
Date: March 28, 2017 04:03PM

What Jim said X2


KadettB
David Stephens
SLC, UT
(10 posts)

Registered:
07/14/2017 03:41PM

Main British Car:
Absolutely original custom freak TBD, probably '98 Vortec 7400

Re: TH350 swap for 700 or 200?
Posted by: KadettB
Date: July 14, 2017 04:42PM

200-4R is same length as short-tail TH350. 700R-4 ratios look bad on paper, but everyone forgets the torque converter. The 700 drives NO worse than any other automatic, and thanks to it's excellent ratios and lockup converter, it drives better when you get the converter stall and throttle valve cable adjustment right. The only reason to ever choose anything else is if you're making over 650 foot-pounds. Then you need a 4L80E. It can be built to hold over 1500


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