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**hatzie** · 12-24-2018, 09:05 PM

The factory AUX coolers for the T800 and T900 are tiny.

That T400 cooler is about the size of a Tru Cool 22,000 lb cooler. That's a big improvement over the stock cooler.

There's a vendor on performance trucks that sells a kit to mount the Tru Cool 47391 40,000 lb cooler on the T800 but you have to cut one of the lines and rotate it 180°. https://www.performancetrucks.net/fo...rdware-508374/

You can buy the JiffyTite push-lok fittings, that GM used on the factory transmission cooler, that screw into the threaded fittings on some of the Tru Cool units like the 47391. If the GM hoses become obsolete it's not a big deal to make them in steel tube with a Mastercool Hydraflare tool. That's what I did to make up a leak free TruCool unit on my Impala.

12-24-2018, 09:05 PM	#5
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,915	Re: Factory trans cooler upgrade The factory AUX coolers for the T800 and T900 are tiny. That T400 cooler is about the size of a Tru Cool 22,000 lb cooler. That's a big improvement over the stock cooler. There's a vendor on performance trucks that sells a kit to mount the Tru Cool 47391 40,000 lb cooler on the T800 but you have to cut one of the lines and rotate it 180°. https://www.performancetrucks.net/fo...rdware-508374/ You can buy the JiffyTite push-lok fittings, that GM used on the factory transmission cooler, that screw into the threaded fittings on some of the Tru Cool units like the 47391. If the GM hoses become obsolete it's not a big deal to make them in steel tube with a Mastercool Hydraflare tool. That's what I did to make up a leak free TruCool unit on my Impala. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 12-26-2018 at 12:40 AM.