MoparFins

Techical Discussions => Tech- - DRIVE TRAIN => Topic started by: Anthony Prescott on September 15, 2010, 12:37:49 PM

Title: bb 727 with overdrive???
Post by: Anthony Prescott on September 15, 2010, 12:37:49 PM
ok... here's the thing. i have a big block 413 industrial with the original heavy duty 727. (or so i've been told. has the brake on tailhousing). My question is about adding an overdrive component. What do you know about the 727 that came in the 90's with the o/d? is it worth a damn? i've heard it is no good because everything (all of the forward gears) are ran through the o/d component. how trustworthy is this transmission? would it snap inside with a big block pushing it? Yes, the bell is set up for a 360, but i found an adaptor. SHOULD I USE IT OR STICK WITH WHAT I HAVE?(http://www.moparfins.com/forum/smileys/smiley9.gif)
Title: bb 727 with overdrive???
Post by: Snotty on September 15, 2010, 02:02:27 PM
That newer OD Trans won't work on your RB because they were made for LA/Magnum motors.  They have a different bolt pattern.  There might be an adapter that would let you use it, but I do not know.
 
By the way, all transmissions had the E-Brake on the tail-shaft in the early 60's.  Having one does not make it an HD unit.
 
Just reread your post.  Obviously there is an adaptor.  (http://www.moparfins.com/forum/smileys/smiley36.gif)
Title: bb 727 with overdrive???
Post by: Brian on September 15, 2010, 02:10:44 PM
If you can find an adapter for the A518 OD unit, then the biggest killer of those trannies was heat.  You need to run a bigger pan, so more fluid , and then a huge tranny cooler to keep the heat under control.




Title: bb 727 with overdrive???
Post by: Anthony Prescott on September 15, 2010, 02:21:25 PM
k sounds good. how are they for pullin heavy stuff up hills? do they snap?
Title: bb 727 with overdrive???
Post by: Steve on September 15, 2010, 03:40:18 PM
There are no adaptors for the 518. Well sorta. There is a Bell housing made which requires you to cut the small block bell off and attach this one.  It is race rated though.  You can do what I did and build the 518 to the Diesel specs. 
 
That trans with the brake on it is a HD trans though.  That's the truck version.  As far as an OD is concerned, you need to control the trans somehow.  You'll have to get a pre 94 trans because it has mechanical governors.  The later ones are solid state which require a TCM.
Title: bb 727 with overdrive???
Post by: Guests on September 15, 2010, 07:32:07 PM
Pick up a copy of your favorite Mopar magazine (ummm, Mopar Action, isn't it Steve???), and in the back of it, or ads throughout the magazine, are transmission companies and adapters out there to make an A518OD work behind any B/RB engine. Computer is not needed, there is a simple wiring harness and a push button mounted to control the overdrive itself.
 
This was a big deal swap 8-10years ago to get overdrive in your B/E body big block ride. It was a frickin' truck tranny, it should be tough enough, but as Steve said, extra tranny cooler, oversized, but remember, most of the truck tranny burning up problems were a result of the tranny lines being less than half an inch from the exhaust pipe, not working them too hard to make them fail.
Title: bb 727 with overdrive???
Post by: Snotty on September 15, 2010, 08:25:23 PM
Quote from: POLARACO


 
Steve, they all had the brake on the tail shaft, from Darts to Imperials.
Title: bb 727 with overdrive???
Post by: Stan Paralikis on September 16, 2010, 02:49:27 AM
http://www.gearvendors.com/hrdodge3s.html (http://www.gearvendors.com/hrdodge3s.html)


Title: bb 727 with overdrive???
Post by: Snotty on September 16, 2010, 09:24:42 AM
I, too, was thinking in that direction Stan.  But, if he wants to hook up a transfer case, can this unit be used?
Title: bb 727 with overdrive???
Post by: Steve on September 16, 2010, 09:28:33 AM
If he uses a separate one, yes.  Otherwise no
 
It might be less expensive to change the rear ratios
Title: bb 727 with overdrive???
Post by: Leaburn Patey on September 16, 2010, 02:02:47 PM
Stupid question...The trans with the drum on the end,do they not have a rear pump as well?? Like the older Torqueflites??
IIRC,1966 with the first year for the 727 to NOT have the rear pump.
 
Title: bb 727 with overdrive???
Post by: Steve on September 16, 2010, 03:07:09 PM
Quote from: CBarge
Stupid question...The trans with the drum on the end,do they not have a rear pump as well?? Like the older Torqueflites??
IIRC,1966 with the first year for the 727 to NOT have the rear pump.

Wrong
 
62 was the last year for the drum, first year aluminum
63 was the first year for park and no drum.  It did still use the ball and trunion.  Same in 64
65  Last year rear pump, first year slip yoke and last year cable shift in production cars.  Cables were use for a few more years in he trucks and early MoHomes.
Title: bb 727 with overdrive???
Post by: Jason Goldsack on September 16, 2010, 05:15:26 PM
Cables suck.. I wish mine had linkage..  Then it would be easy to swap trannies if I break i t..

Stupid cable goes out of adjustment every few years, I have to play to get it into reverse.. cables suck

Title: bb 727 with overdrive???
Post by: Snotty on September 16, 2010, 08:11:05 PM
Quote from: POLARACO
 
 

Not true.  It was the last year for the drum on the shaft for lighter cars.  Dodge 880s and larger Chryslers continued to use them through '64.
Title: bb 727 with overdrive???
Post by: Steve on September 16, 2010, 08:23:55 PM
I dunno about that Scott.  That trans you saw on the trailer came from a 64 Imperial.   There is no drum provisions on that what so ever.
 
I remember my 64 Fury use the rear brakes as the 63 Belvie did
Title: bb 727 with overdrive???
Post by: Guests on September 16, 2010, 09:30:57 PM
Car that got me into Mopars was a 64 Custom 880. It had pushbutton, rear pump, no drum brake on the rear. Possibly this late in truck applications?
 
On, and a Gearvendors overdrive/underdrive will not work with transfer case, and besides, it is about $2800 after everything is done. I say hi/low transfer case to do the trick of lower gearing, and if you look at some of the links, the T-18 has some very steep gearing, like first gear granny ratio of 48:1 for good, smooth rock climbing. If that doesn't work, well, time to get a really big winch to pull things out of the woods if it is that stuck.