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**hatzie** · 10-31-2015, 03:13 AM

I had a K3500 SRW with the 4L60 stock... Bare bones white 1989 WT package fleet truck. Sealed beam rectangular headlamps like my avatar, Vinyl seat, and Vinyl floor cover. 4x4 & OD were about the only options on it. The TH400 would've been a better choice. I could've bought a Gear Vendors OD for the price of the two re-builds.

The 4L60 has some updates internally that make it more reliable than the 700R4. They didn't cool any of them very well. Your Impala is testament to what happens with their poor transmission cooling. If it were run at 165F rather than 200-210F the 4T65E would last more than 50-80K.

Here's to a good search... The free TH350 sounds like a good choice for right now. Put a Magnefine filter in the cooler return line to catch any pieces of the old tranny.

10-31-2015, 03:13 AM	#10
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,021	Re: been a rough week I had a K3500 SRW with the 4L60 stock... Bare bones white 1989 WT package fleet truck. Sealed beam rectangular headlamps like my avatar, Vinyl seat, and Vinyl floor cover. 4x4 & OD were about the only options on it. The TH400 would've been a better choice. I could've bought a Gear Vendors OD for the price of the two re-builds. The 4L60 has some updates internally that make it more reliable than the 700R4. They didn't cool any of them very well. Your Impala is testament to what happens with their poor transmission cooling. If it were run at 165F rather than 200-210F the 4T65E would last more than 50-80K. Here's to a good search... The free TH350 sounds like a good choice for right now. Put a Magnefine filter in the cooler return line to catch any pieces of the old tranny. __________________ 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; 11-01-2015 at 09:07 AM.