transfer case questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Illinois CST · 12-14-2003, 01:41 AM

Hi guys, I just bought a 700R4 tranny and transfer case out of a 88 chevy 1/2 ton. I'd like to put the tranny in my 70 blazer. I'm guessing the transfer case won't work, the front output appears to be on the wrong side. What transfer case can I use for this application? Anyone have anything available near southern Illinois? Thanks, Willie

breeh · 12-14-2003, 03:09 AM

You can use an NP205 transfer case with a TH350 adapter and an Advance Adapters shaft in the 700R4. Do a search. This conversion has alot of coverage.

Illinois CST · 12-14-2003, 12:04 PM

Thanks Breeh, I used the search feature and got a lot of good info on the 205. That route seems like it will be pretty expensive. Can you bolt up a 208 to this tranny and use it in the blazer? I've heard they were weak though, is that something I should stay away from? Willie

breeh · 12-14-2003, 02:50 PM

I really don't know anything about the 208 case other than it is a chain drive case and is not as strong as the 205 which is gear driven.

mrein3 · 12-14-2003, 03:16 PM

I converted my 3-on-the-tree/NP205 4x4 to a TH350/NP205. In my narrow little mind it was the best move I've ever made with this truck. When doing the conversion I decided NOT to go with a 700r4 because I mostly tow with this vehicle and since you shouldn't tow in overdrive with that transmission I went with the th350.

It has been two years or better now and I've had a lot of time to think about it. And drive it.

Now I wish I would have went with the 700r4. A lot of people think they are weaker and the first couple of years they were. However if you tow only in drive, and don't have a fire breathing big block in front of it, it should last as long as a th350.

Not to mention in a truck like mine with 373 rear end gears it probably will extend the life of the engine by keeping it at lower rpms on the highway.

I wish I would have gone overdrive so bad I recently bought a 700r4 core. When I get the advanced adapters output shaft I'll take it and the tranny to a well regarded rebuilder, have it rebuilt, and get it in there.

To make a long story short your Blazer probably already has the NP205. Suck it up, buy the advanced adapter output shaft, and do it right the first time. I wish I did.

Illinois CST · 12-14-2003, 04:17 PM

Thanks for the responses fellas I wish it were simple as converting my 205 but that's not the case. For some reason (which no one can explain) my factory 4 spd came with a Dana 20 transfer case. The transfer case broke the rear output shaft so that led me to opt to put an automatic in. I guess I will have to find a auto 205 with its shifter and adapter and go that route. Does anyone know if a 208 will bolt right up to my 700R4? That would be the other option I guess. If anyone else has any suggestions feel free to contribute, I think I'm going to call my local 4x4 shop tommorow and see what he has to say. Thanks again, Willie

MAC67 · 12-15-2003, 12:50 AM

i would pesonally say as far away as possible from the 208.. just my thoughts,, at least a 203 if nothin else,, by the way ,,imin shelbyvile illinois,, which part are you from ?

Mac

Illinois CST · 12-15-2003, 01:31 AM

I'm from out in the country near Venedy, or Okawville Illinois. I don't know if I'll go for a 208 or not, I'm just trying to get my Blazer back together and save some $. ---- Willie

12-14-2003, 01:41 AM	#1
Illinois CST Registered User Join Date: Sep 2003 Location: Venedy, IL Posts: 25	transfer case questions Hi guys, I just bought a 700R4 tranny and transfer case out of a 88 chevy 1/2 ton. I'd like to put the tranny in my 70 blazer. I'm guessing the transfer case won't work, the front output appears to be on the wrong side. What transfer case can I use for this application? Anyone have anything available near southern Illinois? Thanks, Willie __________________ 1970 Blazer CST 350 700R4

12-14-2003, 03:09 AM	#2
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	You can use an NP205 transfer case with a TH350 adapter and an Advance Adapters shaft in the 700R4. Do a search. This conversion has alot of coverage. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

12-14-2003, 12:04 PM	#3
Illinois CST Registered User Join Date: Sep 2003 Location: Venedy, IL Posts: 25	Thanks Breeh, I used the search feature and got a lot of good info on the 205. That route seems like it will be pretty expensive. Can you bolt up a 208 to this tranny and use it in the blazer? I've heard they were weak though, is that something I should stay away from? Willie __________________ 1970 Blazer CST 350 700R4

12-14-2003, 02:50 PM	#4
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	I really don't know anything about the 208 case other than it is a chain drive case and is not as strong as the 205 which is gear driven. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

12-14-2003, 03:16 PM	#5
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,254	I converted my 3-on-the-tree/NP205 4x4 to a TH350/NP205. In my narrow little mind it was the best move I've ever made with this truck. When doing the conversion I decided NOT to go with a 700r4 because I mostly tow with this vehicle and since you shouldn't tow in overdrive with that transmission I went with the th350. It has been two years or better now and I've had a lot of time to think about it. And drive it. Now I wish I would have went with the 700r4. A lot of people think they are weaker and the first couple of years they were. However if you tow only in drive, and don't have a fire breathing big block in front of it, it should last as long as a th350. Not to mention in a truck like mine with 373 rear end gears it probably will extend the life of the engine by keeping it at lower rpms on the highway. I wish I would have gone overdrive so bad I recently bought a 700r4 core. When I get the advanced adapters output shaft I'll take it and the tranny to a well regarded rebuilder, have it rebuilt, and get it in there. To make a long story short your Blazer probably already has the NP205. Suck it up, buy the advanced adapter output shaft, and do it right the first time. I wish I did. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN

12-14-2003, 04:17 PM	#6
Illinois CST Registered User Join Date: Sep 2003 Location: Venedy, IL Posts: 25	Thanks for the responses fellas I wish it were simple as converting my 205 but that's not the case. For some reason (which no one can explain) my factory 4 spd came with a Dana 20 transfer case. The transfer case broke the rear output shaft so that led me to opt to put an automatic in. I guess I will have to find a auto 205 with its shifter and adapter and go that route. Does anyone know if a 208 will bolt right up to my 700R4? That would be the other option I guess. If anyone else has any suggestions feel free to contribute, I think I'm going to call my local 4x4 shop tommorow and see what he has to say. Thanks again, Willie __________________ 1970 Blazer CST 350 700R4

12-15-2003, 12:50 AM	#7
MAC67 " SHOW ME" Join Date: Jan 2003 Location: shelbyville illinois Posts: 2,624	i would pesonally say as far away as possible from the 208.. just my thoughts,, at least a 203 if nothin else,, by the way ,,imin shelbyvile illinois,, which part are you from ? Mac

12-15-2003, 01:31 AM	#8
Illinois CST Registered User Join Date: Sep 2003 Location: Venedy, IL Posts: 25	I'm from out in the country near Venedy, or Okawville Illinois. I don't know if I'll go for a 208 or not, I'm just trying to get my Blazer back together and save some $. ---- Willie __________________ 1970 Blazer CST 350 700R4



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