Has anyone here that's not a transmission mechanic rebuilt a 727 trans? I have a big block 727 core correct for my car and I found a small block 727 newly rebuilt with HD parts and stage 2 shift kit for dirt cheap (a third the price of new).

How much of a challenge would it be to swap the guts? is it worth it?

about 5 yrs ago..i decided to rebuild my own trans ...got the ATSG and 727 video...never looked back.

the 727/904 are easy trans to rebuild.

I've been through a few, get yourself an ATSG manual one of the better ones. Haynes manual has photos which can be helpful, but not as much tech. They are not difficult to do, but time consuming. There have been some subtle changes throughout the year spread so pumps can be case specific and the shafts and planetaries and such need to be kept together as there were some differences in the splined areas. The paperwork for the shift kit would be important if any case mods were made. clean is important, a piece of lint can jam a valve.

It'll be a piece of cake, get the manual , check the end play on both trans. before you take them a part , record and compare to the new one after reassembly .

But can you do it blindfolded while hanging upside down in your closet?

That's encouraging! I'm gonna go for it. If I buy new, what kit should I buy, considering its goingbehind a 500 HP 451 stroker? what is an ATSG? Should I go manual valve body? Is There a way to customize the b body shifter so that it works like a slapstik? I hate the idea of gingerly pushing through the shifts.

My first attempt at a trans was a 727 using the B&M $250 kit. It has a good step by step book in it with options on how to build it to suit your needs. I tried it, and it is still in the car to this day after hundreds of passes down into the 10's and some high speed 90 mile long open road races doing over 140 mph. It is very easy if you are patient.

Shift kits are relatively easy. Anything requireing pulling the front pump will need a slide hammer (preferably two but I did it with one). Deeper in there are a few things that are best to remove with drivers made to fit. That's where it can be a real pain. My impression is most folks either leave those parts or (like I did) find someone who has the tools.

I made a stand out of angle iron to hold the case while working on it. Not critical, but something to consider.

Swapping guts may or may not make sense - depends on the years and exactly which guts. The Monroe book on 727 transmissions covers the year to year variations etc. Well worth buying for someone considering swapping parts.

I 2nd that book. Very informative and it has a hipo section for tweaking. Hundreds of pictures in a clear and concise method, you really can't screw up. When I rebuilt mine I was greatly impressed by the previous rebuilder, as I have had this tranny for 25 years and haven't put it into a car yet. I bought the book and did a refresh on the internals. I didn't change any bushings but that isn't really that hard. It's a good time to strenghten your trans for later mods, that's why I went through mine, maybe one day i'll get that stroker.....

Here are some kits that are reasonably priced.

http://www.bulkpart.com/Merchant2/mercha...;Category_Code=

http://www.northernautoparts.com/ProductModelDetail.cfm?ProductModelId=9102

Get a deluxe kit and you should be pretty set.

B Body Bob had the best IIRC

A wheelbarrow stood up with the trans between the handles... Priceless Wish I had a pic of it.

Timely . . . Just before christmas, I was at my buddies place in Spokane, and we rebuilt a small block 727 . . . he is the seasoned vet, and I had NEVER pulled a tranny apart before. Course he made it look easy, but realistically, having the book, and the tool for holding the pistons down on the springs in order to get the snap rings in, made everything way easy !!!

I figure you just take your time, pull it apart, inspect everything and replace your steels & clutch discs & thrust bearings/washers and your seals, and you will be good to go !!!

Course my buddy has a hot tank washer unit - man it works great !!! So the case was like brand new again !!! . . .never used a slide hammer to pull the front pump out of the case, took the guts out and then just "tapped" the front pump out using a hammer and extension . . . .

After doing this one tranny, with his help, I would certainly say, go for it !!! . . .

Cheers

Mark

It's been a few years since I did a rebuild and have only done a few. It seems to me that all of the pumps I pulled had additional threaded holes that I screwed bolts into to "push" the pump out. Removed all of the bolts holding the pump in and then threaded/ran the bolts in to remove the pump. Didn't need a slide puller.
Russ...

I used two pieces of threaded rod and a chunk of angle iron with the slide hammer and worked very well. Used 2x4 s and a piece of plywood with a hole cut in it to hold the case. Just keep it clean and keep track of where everything came from and you should have no problem.