Thread Tools Search this Thread Display Modes
Old 02-16-2003, 11:27 PM   #1
2 Rivet Member
Join Date: Nov 2002
Posts: 30
TH 400 Transmissions

As my '85 has a few issues and I'm a project nut, I just bought a used engine and transmission that match those in my '85 325. Both blocks have the same numbers and both TH 400's are '84 code FI units with serial #'s 6000 apart.

The plan is to rebuild the units, pull the existing units and replace with rebuilts. Parts question: What TH 400 do I have? (Later I'll have a bunch of engine questions for 74Argosy24MH John--I've seen his pictures).

A while back there was a mention of the TH 425 Tranmission on the forum and, as I recall, Fred's website lists the '85's as having 425's. GearVendors catalog lists no 425's but does list 475's

I just got a book loaded with codes, model numbers and interchange data. I see only one mention of the AS 425. It says "Front-drive Turbo Hydra-matic 425 interchange note......" (GMC Motor homes, Toronados and Eldorados?).

The code listing identifies 1973-82 Chevy, 14,000 GVW "Mobile" (I think they mean "Motor") Home chassis as having TH 475's. '83 thru '88 "Mobile" Homes and school buses are shown as 475's
My '84 units are both have "FI" codes and are shown as 475's

Some P chassis and other "Mobile" Homes are shown with straight TH 400's.

The only description in the book of 475's identifies them as having internal parts for heavy duty use the most obvious of which is straight cut planetary pinions.

OK all you gearheads out there, tell me your year and code and let's see what the book says so we can get Fred's website up to snuff.

Jim with the TH 475.

Bronze Dancer is offline   Reply With Quote
Old 02-17-2003, 06:05 AM   #2
Rivet Master
LOST , Hawaii
Join Date: Jun 2002
Posts: 2,193
I'll take the rap on this one. Back when Fred started the matrix I said I had a 425. I talked to my tranny buddy and he told me, as usual, stay away from transmissions. The 425 is the front wheel drive, 475 is the hd version of the 400. Please don't kill me Fred, I am too young and dumb to die.

74Argosy24MH is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Motorhome Saga 87MH Airstream Motorhome Forums 44 02-10-2009 06:09 PM
trans flush - your opinion baldeagle Tow Vehicles 44 03-09-2004 05:17 PM
Transmissions? Dave Cole On The Road... 8 10-17-2002 06:24 AM
Fan-Tastic fan??? definition needed hex Our Community 26 10-10-2002 02:17 PM

Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:46 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.