Talk:Turbo-Hydramatic

Front-drive entries?
This article's a good start, but it definitely needs to have additions made for the FWD transmissions, since they also fall under the Turbo_Hydramatic nomeclature. --King V 15:19, 4 April 2006 (UTC)


 * Don't forget the four wheel drive and all wheel drive ones. Here's some of the FWD models. Turbo-Hydramatic 125 —The preceding unsigned comment was added by Bizzybody (talk • contribs) 03:05, 13 April 2007 (UTC).

TH400 or THM400?
Both names are used, what is the correct? PerDaniel 17:22, 7 December 2006 (UTC)

Arbitrary Strength?
It was written that the TH400 was renamed the 3L80, with the designation meaning 3 speed Longitudal, and a "Arbitrary" strength reating of 80, yet other Wikipedia articles seem to indicated that the 80 is short for 8,000lbs GVW, just as the 60 in 4L60 indicates 6,000 GVW; the maximum vehicle weight the transmission is designed for. —Preceding unsigned comment added by 139.78.98.3 (talk • contribs) 0:53, 11 April 2007
 * If the strength rating being a gross vehicle weight in pounds is a referenced fact in other articles, then the same references can be used in this article. What other articles is it in? I suspect, however, that it should be GCW rather than GVW. --Athol Mullen 02:00, 13 April 2007 (UTC)
 * it has to do with engine torque, not gcw, or gvw....i have a 92 extended cab stepside with a 350 and a 4L60(700r4) and an 86 1/2 ton suburban with a 350 and 4L60 trans(700r4) both have gvw's exceeding 6,000 lbs, and gcw's exceeding 12,000lbs —Preceding unsigned comment added by 70.254.44.246 (talk) 03:59, 1 July 2010 (UTC)

TH400, THM400 3L80 and 4L80E
How about a bit more on the 4L80E, simply a THM400 with an overdrive and electronic control as fitted to Rolls-Royce and Bentley cars from 1992 ? From 1965 until 1992, all Rolls-Royce and Bentley cars (apart from RHD cars until 1968 and most Phantom VI cars, which are fitted with the 4-speed Hydramatic similar to those from RR/B from 1952), until 1992, have the 3L80. Rolls-Royce SZ (Silver Spirit and derivative) cars from 1992 have the 4L80E. Holden in Australia fitted the 3L80 to tens of thousands of the larger V8 cars too, and Aston Martin was another. In the global Rolls-Royce and Bentley community, the Hydramatic, the THM400 - 3L80 and the 4L80E are very well known indeed. The Hydramatics and sucessors are a phenomenal success in those cars, with motors ranging from 6-cylinders ones of 4556cc to tubocharged 6750cc V8 variants.

Try http://rroc.org.au/wiki/index.php/Technical_Library

to see that there is already an enormous amount of Hydramatic, THM400 - 3L80 information online and it is growing. — Preceding unsigned comment added by 77.57.1.239 (talk) 15:58, 9 June 2007 (UTC)

700R4 Application section
There are many more vehicles needing to be added to this list. I got tired of editing it...

For starters, check the second reference for this section which I only made it about 1/3 the way through.

Sbs9 (talk) 18:41, 21 December 2007 (UTC)

4L70 / 4L70E ?
Isn't that the trans used in HD trucks now? Haven't found anything on wikipedia about it. Not regular trucks, but 2500hd and 3500hd with autotrans that don't have the alison. (typically with 6.0L or 8.1L) P HARMBOY  ( TALK ) 00:19, 30 August 2008 (UTC)

clearing up....
above, all th400, thm400, and 3L80 are correct for turbo hydromatic 400 transmission

above, you have a point, the fwd transmissions are turbo hydromatic, my 95 Pontiac Bonneville has a 4T60E transmission, and on the bottom of the pan it says "turbo-hydromatic; division of GMC.

above, yes, torque converters do fail, rarely, but they do, also, you could have an unnoticeable failure, such as a bad servo for first gear, and if first doesnt work, none do

ok, now to my point, i have a 1987, yes, 1987 R10(C10) shortbed, code 90 gray paint, custom deluxe, tbi 4.3L vortec V6 with a th350 trans, this article states that its last use was in 86, but since my 87 came factory basic with one, this cant be true.... —Preceding unsigned comment added by 70.254.44.246 (talk) 03:53, 1 July 2010 (UTC)

Nomenclature Change - 1987 or 1990?
Did GM actually introduce their automatic transmission model nomenclature revision in 1990 instead of 1987?

I'm asking because by 1990 many of their automatics still used the older nomenclature until being phased out in favor of newer models, such as the 700-R4/4L60 being replaced by the 4L60E (and later the 4L65E) and the 400C/3L80 being replaced by the 4L80E. If GM did introduce the naming scheme for the 1987 model year, then surely all their transmissions would've had the revised nomenclature, correct?

Old model first, new model last
 * TH200C = 3L40
 * TH200-4R = 4L40
 * TH400C = 3L80
 * TH700-R4 = 4L60

This information about GM's changing the nomenclature for 1987 seems conflicting because the previous nomenclatures for most of these models persisted as late as 1990.

WikiPro1981X (talk) 04:36, 17 April 2014 (UTC)

TH250
The statement "Usually the THM250 was coupled to smaller displacement engines - the largest a third generation Chevrolet inline six found in the Nova and Camaro (1974 and 75 model year only)." is incorrect. I own a 1984 Pontiac Grand Prix that came stock with a 305 V8 (5.0 l) and a THM250C. It is the "C" variant with the lockup converter, but still a THM250 and the 305 V8 is larger than a straight six. The transmission was rather weak and it failed around 1987, then again (when I bought the car) around 1990 and for the last time in 1994 (when I had it upgraded by a local shop). I've still got it (parked behind my main barn), complete with the TH250C.

For a reference link that confirms the TH250C was used in the 1984 Grand Prix behind a 305 V8, I found the following GM parts catalog that shows the combination: https://www.rockauto.com/en/catalog/pontiac,1984,grand+prix,5.0l+305cid+v8,1255182,transmission-automatic,governor+cover,23075 76.69.61.139 (talk) 04:16, 3 May 2020 (UTC)
 * The statement in question is referring to the original THM250, not the later THM250C that was introduced in 1979. --Sable232 (talk) 14:40, 3 May 2020 (UTC)