Info Needed - 55-59 Hydramatics

[mphudak]

Looking for anyone that has a 1.5 ton or bigger chevy truck w/a hydramatic in it. Specifically i'm interested in the prefix on the Hydramatic. I'm trying to locate what my HM is out of as it is a "CHT" which isn't listed in any of the books nor do any of HM restorers know what it is from. Any info is greatly appreciated. Mine is a 4spd with a standard case.

[dwcsr]

It may well be from a Lincoln, Packard, Chevy, GMC, Rambler or a few others. It was used in many cars and trucks when it first came out. Post a picture and the full ID number

[mphudak]

I'm pretty confident it's a chevy unit, it has the chevy v8 bellhousing/starter/torus (small torus and 18 bolts). The 1/2-1 tons used either a ch or chc prefix, just nothing listed for the 1.5 and bigger. The 4 bolt flange leads me to believe it is the parking brake assy for a bigger truck. I have found reference to the black tag being the 1.5-2 ton unit, but it refers to the side tag (oval shaped one) that isn't present on this housing, nor is there the casting for it.

[mphudak]

For reference, here is the Paul Marsh HM manual reference data, omitting the Chevy +1.5 ton info

[dwcsr]

try contacting this guy, He specializes in these transmissions
http://www.restorationhydramatics.com

[mphudak]

I have sw gene and several other shops that specialize in the HM and none of them know anything about the cht code. Unfortunately that is why I am looking for someone that has a 55-59 1.5 ton or bigger hydramatic to confirm what code there trans has. I've been on stovebolt and oldgmctrucks with no luck. I have found one other cht-55, but it was in a 54 1/2 ton and the gentleman is as perplexed as I am. His was converted to a torque tube but he has no idea where the previous owner got it from.