TH200-4R Transmission question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Raymond Thompson · 05-13-2009, 05:34 PM

I know someone must have replaced their TH-350 with a TH200-4R...There is an electrical plug on the driver side of the 200-4R. It has 3 wires. [U][SIZE="4"]Where do they go and what do they do. U]I'm about to make the swap to get some gas mileage, and to get my rpms down on the highway. With a 3.73 gear, I must be turning 3000 rpms at 65mph. Please give me a private message if you know what to do with these wires.

Longhorn Man · 05-13-2009, 07:32 PM

They are to control the lock up on the torque converter.
I highly recomend reading up on this swap before you jump in head first. If you don't do it right, you'll get to do it again.
And just becouse it feels right, doesn't mean anything. You have to set up the TV cable just right.
A good place to look and learn about them is www.bowtieoverdrives.com ... It isn't just plug and play, there is work to do, and things to figure out.

powell72 · 05-13-2009, 09:51 PM

Quote:

Originally Posted by Longhorn Man

They are to control the lock up on the torque converter.
I highly recomend reading up on this swap before you jump in head first. If you don't do it right, you'll get to do it again.
And just becouse it feels right, doesn't mean anything. You have to set up the TV cable just right.
A good place to look and learn about them is www.bowtieoverdrives.com ... It isn't just plug and play, there is work to do, and things to figure out.

I couldn't agree more.

Raymond Thompson · 05-14-2009, 08:10 AM

Yes - I suspected that was what they were for... I have already been to the Bowtie site and read pretty much everything they had to say about the swap and how important the TV cable settings are.

My next question then, is about torque convert. lockup... Is the stock TConv a lockup unit ? The original transmission and TConv came from a 87 Impala.

72BlckButy · 05-14-2009, 08:27 AM

Definitely interested in this swap as well... I know that there was a recent thread about the 200R4 swap, and it was in the 67-72 message board. I'll try to locate it.

Longhorn Man · 05-14-2009, 09:10 AM

yes, it came with a lock up converter.

Lugnut64052 · 05-14-2009, 09:25 AM

Here is a good tip sheet on installing a 200-4R.

Here's a thread on how to get the lockup to work. It talks about late TH350s, but the same wiring scheme will work for them, a 200-4R and a 700R4 of you're not using a computer control.

There are quite a few home grown information pages on the 'net about the 200. You might do some Googling and see what's out there. Here's some general information and there's a paragraph in there about swaps and some lockup information.

Good luck and let us know how it turned out.

Raymond Thompson · 05-14-2009, 09:39 AM

OK then... If I install this trans. with the original TConv. and original TV Cable, and get the WOT position correct, and buy the converter lockup kit... then do I need to buy the "EZ TV System" from Bowtie Overdrives? My QJet carb numbers don't show on their listing of carbs, but it closely resembles the QJet 1910 model. They also want you to open the transmission and replace the spring in the TV valve if you use their EZ TV System. Hope I don't have to do that... Comments? Does it sound like I have a fairly good understanding of this process... or am I missing something?

05-13-2009, 05:34 PM	#1
Raymond Thompson Registered User Join Date: Nov 2008 Location: Madison, NC Posts: 34	TH200-4R Transmission question I know someone must have replaced their TH-350 with a TH200-4R...There is an electrical plug on the driver side of the 200-4R. It has 3 wires. [U][SIZE="4"]Where do they go and what do they do. U]I'm about to make the swap to get some gas mileage, and to get my rpms down on the highway. With a 3.73 gear, I must be turning 3000 rpms at 65mph. Please give me a private message if you know what to do with these wires.

05-13-2009, 07:32 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: TH200-4R Transmission question They are to control the lock up on the torque converter. I highly recomend reading up on this swap before you jump in head first. If you don't do it right, you'll get to do it again. And just becouse it feels right, doesn't mean anything. You have to set up the TV cable just right. A good place to look and learn about them is www.bowtieoverdrives.com ... It isn't just plug and play, there is work to do, and things to figure out.

05-14-2009, 08:10 AM	#4
Raymond Thompson Registered User Join Date: Nov 2008 Location: Madison, NC Posts: 34	Re: TH200-4R Transmission question Yes - I suspected that was what they were for... I have already been to the Bowtie site and read pretty much everything they had to say about the swap and how important the TV cable settings are. My next question then, is about torque convert. lockup... Is the stock TConv a lockup unit ? The original transmission and TConv came from a 87 Impala.

05-14-2009, 08:27 AM	#5
72BlckButy Tot Roddin' Join Date: Apr 2005 Location: Mid-MO Posts: 24,461	Re: TH200-4R Transmission question Definitely interested in this swap as well... I know that there was a recent thread about the 200R4 swap, and it was in the 67-72 message board. I'll try to locate it. __________________ -Nate 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package)

05-14-2009, 09:10 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: TH200-4R Transmission question yes, it came with a lock up converter.

05-14-2009, 09:25 AM	#7
Lugnut64052 Middle-aged Curmudgeon Join Date: Jun 2008 Location: Independence, MO Posts: 753	Re: TH200-4R Transmission question Here is a good tip sheet on installing a 200-4R. Here's a thread on how to get the lockup to work. It talks about late TH350s, but the same wiring scheme will work for them, a 200-4R and a 700R4 of you're not using a computer control. There are quite a few home grown information pages on the 'net about the 200. You might do some Googling and see what's out there. Here's some general information and there's a paragraph in there about swaps and some lockup information. Good luck and let us know how it turned out. __________________ Bret Check out the site's Truck Tech FAQ. Be a site supporter. My more-or-less pathetic build thread. Board members I've met: ------------------------------ Longhorn Man Dieselwrencher jholley big mike71

05-14-2009, 09:39 AM	#8
Raymond Thompson Registered User Join Date: Nov 2008 Location: Madison, NC Posts: 34	Re: TH200-4R Transmission question OK then... If I install this trans. with the original TConv. and original TV Cable, and get the WOT position correct, and buy the converter lockup kit... then do I need to buy the "EZ TV System" from Bowtie Overdrives? My QJet carb numbers don't show on their listing of carbs, but it closely resembles the QJet 1910 model. They also want you to open the transmission and replace the spring in the TV valve if you use their EZ TV System. Hope I don't have to do that... Comments? Does it sound like I have a fairly good understanding of this process... or am I missing something?

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