th350 to 700r4 to np205 question

[man-a-fre]

I have a 72 blazer with a th350 np205 combo that im wanting to put a 700r4 in front of the np 205 i know advanced adapters sells an output shaft for the 700 to go to the np205 then i move the engine forward,my question is will the rear output out of the stock th350 or any other stock trans be the right part i need so i dont have to spend the 200 bucks for the shaft. Ther has to be a stock shaft that is the same as the advanced adapters i would think.

[mrein3]

Originally Posted by man-a-fre

I have a 72 blazer with a th350 np205 combo that im wanting to put a 700r4 in front of the np 205 i know advanced adapters sells an output shaft for the 700 to go to the np205 then i move the engine forward,my question is will the rear output out of the stock th350 or any other stock trans be the right part i need so i dont have to spend the 200 bucks for the shaft. Ther has to be a stock shaft that is the same as the advanced adapters i would think.

I haven't done this mod yet (th350 -> 700r4) but it is on my short list.
From what I've read on these pages the ONLY way to go is the Advanced Adapters output shaft. Others have used some fly-by-night spacer. With the spacer some folks say use this output shaft and cut it shorter. Others say use a dremel tool to lengthen the splines on that output shaft [dremel splines into a hardened shaft that is coming out of about $1000 worth of transmission?!?].

Save your pennies until you can do it right. Purchase the AA shaft. Get a quality rebuild as long as you have to disassemble the 700r4 to put the shaft in. Do the mod right the first time then move on.

BTW, the last time I checked the AA shaft was cheaper at Summit than at AA's website.

[Thealien]

I haven't had the greatest luck dealing with the AA techs. I am using their shaft in a 4L60 to NP205 with their 6 bolt to 4 bolt spacer which they told me makes my transmission the same length as a 700R4.
Here are the parts I am using. From what I have been told it is just a 700R4 output shaft that has had some of the shaft machined (not the splines) to accept the reluctor ring for a variable speed sensor.

Here is a site that shows the measurements of the transmissions to the flange (where the adapter would bolt to)
HERE

From what I can figure is the output shaft that they modify is from the earlier 700R4s?

Good luck and keep us posted on what you find.

[man-a-fre]

Okay, don't want to do the dremel tool thing ,just wondering if i have a pile of 350 trans output shafts from a four wheel drive measuring 4",a short shaft two wheel drive measuring 6" and a long shaft measuring 8" would any of those work without dremeling.Wish i could get measurements off the advanced adapters shaft like from the end splines to the gov gear,and the lenghth of the splines to put this to rest. Im pretty sure a 350 output will go right in a 700 r 4 and possible a stock 350 4 wheel output or short shaft two wheel output may be what advance is selling.

[man-a-fre]

What shaft did this guy use and alo i've seen guys say there is 84-85 chevy 3/4 tons with 700r4's mated to np205's stock. http://phoenix.craigslist.org/wvl/pts/1559736201.html

[mrein3]

Originally Posted by man-a-fre

What shaft did this guy use and alo i've seen guys say there is 84-85 chevy 3/4 tons with 700r4's mated to np205's stock. http://phoenix.craigslist.org/wvl/pts/1559736201.html

Looks to me like he used the Advanced Adapters, 700r4 in place of a th350 output shaft.

[68K30]

I put a post on the Blazer board last week about my 350 to 700 conversion.