TH400/TH475 - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 10-10-2000, 11:00 AM
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Hey guys,
I've seen some mention of TH475 transmissions, I was planning on sending the TH400 tranny out of my 85 suburban to the shop and was wondering what kind of mods need to be done to get a TH475.

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post #2 of (permalink) Old 10-10-2000, 02:56 PM
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Re: TH400/TH475

The main difference is that the TH475 has straight cut gears in it, and the TH 400 has helically or angle cut gears. The angle cut ones are quieter , but they are not as strong because they can pry apart under a heavy load. The straight cut ones are really strong and they are used in motorhomes and like C60 trucks.

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post #3 of (permalink) Old 10-10-2000, 03:39 PM
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Re: TH400/TH475

The TH400 is one of the Best/Strongest Auto tranny's ever built! it should give you many, many, years of dependable service[img]/wwwthreads_images/icons/smile.gif[/img].
It's ONLY drawback is not having an OD[img]/wwwthreads_images/icons/frown.gif[/img]

If you are having it rebuilt, I strongly suggest having an "RV" shift kit installed and use a "Heavy Duty" Torque Converter. This will make it shift firmer and is actually beneficial to the trans! Also be sure you have a large external tranny cooler!

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post #4 of (permalink) Old 10-31-2000, 12:46 PM
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Re: TH400/TH475

is the TH700 the one w/ overdrive? is it a durable transmission?

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post #5 of (permalink) Old 10-31-2000, 02:46 PM
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Re: TH400/TH475

<font color=purple>TH700 has O/D, but isn't as durable at TH400. The 4L80E is an O/D tranny that is based on the TH400 & is more durable than the TH700/4L60E.</font color=purple>


post #6 of (permalink) Old 10-31-2000, 02:46 PM
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Re: TH400/TH475

I've heard it's not very strong, but thats just rumor. I might have a th-700 for sale when I scrap the old 84

[img]/wwwthreads_images/icons/frown.gif[/img]<font color=blue> "Such beautiful things exist, and there is nothing keeping us from them but ourselves." </font color=blue>[img]/wwwthreads_images/icons/frown.gif[/img]
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