Your donations help keep this valuable resource free and growing. Thank you.
|
Engine to 727trans maximum misalignment |
Post Reply | Page 12> |
Author | |
Em390
AMC Fan Joined: Jul/10/2022 Location: Kenosha Status: Offline Points: 5 |
Post Options
Thanks(0)
Posted: Jul/23/2022 at 1:20pm |
How much can the engine and transmission be misaligned? 727 torqueflite to 401
|
|
304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Online Points: 9081 |
Post Options
Thanks(0)
|
I am not getting the question. If properly installed, there is no misalignment issues. Are you talking about torque converter or trans mount height? |
|
71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
|
farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19611 |
Post Options
Thanks(0)
|
The engine to transmission centerline can only be off 0.003" or so -- hardly any at all! Much more and you'll have vibrations and other issues. That's why there are alignment dowels on the engine for the bell housing and the trans is a snug fit in the hole in the back of the bell (on older autos and manuals with separate trans/bell). I had an engine that had been in a wreck and the alignment dowels sheared off. Aligning the (manual) trans with just the bolts wasn't good enough, after about 300 miles the center of the clutch ripped out even though it only had some vibration and chattering the first 50-100 miles, then seemed to "wear in". I doubt a torque converter would last that long! replacing the dowels didn't help much, got about 700-800 miles out of it! When it started to make a little noise at about the 400-500 mark, I started looking for another block. Luckily this was a common 4.0L block. Hard to find a good used one in 98 when I started, but by 2000 they were more plentiful in salvage yards because the 4.0L powered Jeeps were so popular and by then 10 year old models were nearing their end of life -- not because the engines were bad!
|
|
Frank Swygert
|
|
6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
Post Options
Thanks(0)
|
You can dial in a TF case the same way you can dial in a bell housing using the pump bore.
|
|
Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
|
Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6762 |
Post Options
Thanks(0)
|
Have seen them off by as much as 0.015" on Fords. They would not make these if it was not a common issue:
Never had an AMC off by more then 0.005".
Edited by Trader - Aug/01/2022 at 8:03am |
|
Ken_Parkman
AMC Addicted Joined: Jun/04/2009 Location: Ontario Status: Offline Points: 1815 |
Post Options
Thanks(1)
|
I bought an aftermarket adapter for a powerglide to AMC years ago. The runout was something like .100" (which contributed to my hatred of adapters) which obviously would have destroyed the glide. I got it to about .008" (IIRC) which seemed to be mostly OK, but I didn't like it. I would break a TH400 style flexplate about every 100 passes, but I really think that was mostly the plate simply not strong enough. Then I got an Ultrabell which was just aligned by bolts when they came out and it was about .020". In a rush and thought it might be OK, took the pump out of the glide.
Figured out how to align it, it's .001" now. Also why I am a freak on proper alignment.
Edited by Ken_Parkman - Aug/01/2022 at 9:31pm |
|
DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
Post Options
Thanks(0)
|
I guess I have been lucky.....knock on wood. I have never aligned an auto tranny in any of my cars. That includes 400 turbo with ultrabell, powerglide with ultrabell, and stocker 400 and 727 transmissions. Never had a problem. You would know it quick when the front pump bushing and seal are out.......transmission fluid would be gushing I would think ?
|
|
Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
|
|
Ken_Parkman
AMC Addicted Joined: Jun/04/2009 Location: Ontario Status: Offline Points: 1815 |
Post Options
Thanks(1)
|
It took a while to damage the pump. I found the bushing and pump gears scored on winter maintenance, so it was not a total disaster. But it made me make it straight by slightly enlarging the ultrabell bolt holes, spending a huge amount of time getting a runout on the stator support, then tapping it around to get zero, tighten the bolts, then drill the properly aligned ultrabell and pump housing for dowel pins. Now it is repeatably straight on assembly.
I usually don't worry about proper factory assembly. The OEMs have proper engineering and quality control; they have to or they would be bankrupt. (oh yeah AMC is no longer around! But I don't think because of that) But I have a healthy distrust of aftermarket Engineering and quality control or lack thereof! In Engineering terms bolts don't line anything up.
Edited by Ken_Parkman - Aug/04/2022 at 9:24pm |
|
DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
Post Options
Thanks(0)
|
Great idea!
|
|
Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
|
|
Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3760 |
Post Options
Thanks(0)
|
OE parts you install on the block's dowels and that's it IMO. You can check it if you want to, but....
Anything aftermarket you need to check with a dial indicator. The problem is that I don't think there are any offset dowels made for AMC. Years ago I had some made for a Lakewood bellhousing that was ~.010 out of center....
|
|
Post Reply | Page 12> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |