MoparFins

Techical Discussions => Tech- - DRIVE TRAIN => Topic started by: Jason Goldsack on August 05, 2010, 03:08:52 PM

Title: Shift Kit.
Post by: Jason Goldsack on August 05, 2010, 03:08:52 PM
How hard is it to install a shift kit in a 1965 BB 727? 

Title: Shift Kit.
Post by: Snotty on August 05, 2010, 03:13:33 PM
Don't know.  However, all I've ever read and been told is that it's better to switch up to a '67-newer 727 if you really want to make one run for performance.   I realize you would have a problem due to the cable operation on your '65 transmisson.   But, the valve body is supposed to be significantly different from '67 on which makes them ideal for building.
Title: Shift Kit.
Post by: Steve on August 05, 2010, 03:30:22 PM
It's just a valve body unless you bought the big kit.  If that's the case, the trans needs to come apart
Title: Shift Kit.
Post by: Jason Goldsack on August 05, 2010, 03:40:01 PM
I am still thinking of firming up the shift on Old Eileen... the second to third shift is a little weak..

Title: Shift Kit.
Post by: Steve on August 05, 2010, 04:07:02 PM
How about just doing a band adjustment?
 
You have to take the valve bodies out to do a shift kit.  If you don't do it right, you could end up with a slammer.  Maybe the O-Rings in the servo is tired.
Title: Shift Kit.
Post by: Steve on August 05, 2010, 04:09:24 PM
Something else Jason
 
Maybe you should take the valve body out and clean it real good.  Not much too it, but the little orifices in there can collect crud, especially in a low used trans.  I think you can drop the servo pistons without a big hassle.  The rings in the trans itself are mostly metal, so there should be no big deals in there unless you find a piece in the pan. . .
Title: Shift Kit.
Post by: Jason Goldsack on August 05, 2010, 04:11:39 PM
I was thinking that..

A few years ago I had the bands adjusted by the local Mopar nut ( the one with the original 6 pack Fury) because it was delaying the shift into reverse.. That helped a bit

If you are at part throttle there is a bit of overlap into third... the linkage is set correctly so some in the old tranny is getting tired I think.


Title: Shift Kit.
Post by: Jason Goldsack on August 05, 2010, 04:16:49 PM
I certainly hope I don't find anything in the pan.. been there with the Big Block Aspen with the clutches let go and filled the pan..




Title: Shift Kit.
Post by: Guests on August 05, 2010, 07:52:10 PM
Shift kits are very simple for the 727, cable or not shifter. Agree a newer one has a little stronger valve body, but it really isn't a major street shift kit concern, behind a Hemi is a little different. You have to drop the pan to adjust one of the two bands and the only gasket you have to worry about is the pan gasket, so that is simpler than the competition out there (for these anyway). There is a line pressure hex screw on the side of the valve body, a couple check balls come out, and a small slot put into the valve body internal (good directions in the kit, lots of pictures, and drill bit and guide for the passage modification included). Mopar Performance has a simple kit that works just fine for a whole lot less than the other ones (TransGo and B&M). so save the bucks there. Tear the body apart and simply keep things in exploded view, they only go together one way, but you can forget something, so exploded view disassembly, clean each piece and keep in order. Cleaning everything is important, whether carb cleaner in a can works to get gunk out really good, blow dry or air dry, reassemble with trans fluid. You will need an inch pound (not foot pound) torque wrench and an 8point quarter inch socket (that one you never ever use in a socket set), and the directions will tell you what to torque the bands to and how many turns to back them off properly.
Title: Shift Kit.
Post by: Jacques on August 05, 2010, 10:32:14 PM
Another option is a 73& later valvebody. From 73-on there's a much improved 3-2 part throttle downshift which is really convenient.
 
Avoid B&M shift kits, those are of inferior design and only aim at "bang bang"shift-feel but do not result in actual shorter shifts.
Title: Shift Kit.
Post by: Jason Goldsack on August 08, 2010, 08:46:07 AM
I don't want bang.. just crips

Title: Shift Kit.
Post by: Steve on August 08, 2010, 09:16:57 AM
Then my suggestion is to do a band adjustment, but cut the bands back 1/4 turn on the adjustment.  Instead of a 2 1/2, do 2 1/4
 
Clean the valve body and throw a tad of brake fluid into the fluid.  It will soften up the o-rings a bit
Title: Shift Kit.
Post by: Guests on August 08, 2010, 12:21:47 PM
Also, turn up the line pressure itself. The adjustment is something like 1 and 3/8inch, turn it up to 1 and 3/4 inch (that's that little allen wrench in the sheetmetal frame with two or three screws attachment. This saves clutches and bands more than anything else.