How durable is the 4T60 that'* on my SSEi? I'm just a little worried about modding since the tranny was used for S1 cars, and only one year in the S2 L67 before the 4T65-HD came out.

better that the 65 but less aftermarket

That'* good to here, the aftermarket does suck though. I'll just have to live with the stock PCM and upgrades for the S2.

The 60'* will take a good beating.....but just be nice to them....

yes you are restricted by the PCM, but there are more upgrades than the S1

Huh? The 4T60E is a lot weaker than a 4T65. The higher the # of the trans, the heavier the duty. I am on my second 4T60E in 70,000 miles. My friend'* 92 bonneville with 130k miles has no 3rd gear. My other friend'* 135k 97 Bonne SE is in need of a trans as well, it exhibits the same TCC severe shudder that mine did before I replaced it. Not a strong trans by any sense of the imagination. Wow theres a lot of bad information floating around. The 4T60E is a hybrid hydraulic/electronic controlled trans. It still uses an old fashioned vacuum line pressure modulator. The 4T65E is completely electronic, and MUCH stronger than the 4T60E.

the 60 is more reliable than the 65 never said that it was weaker. ther 65 has way more problems than the 60

the # of the trans has nothing to do with the strength. that is why there is a HD version for the L67 application

The # of the trans mosty certainly DOES have to do with the strength. the "T" in 4T60E stands for Transverse application, and the 60 is the relative duty rating. I. E. 4L60E (rwd) L is for Longitudinal application. The 4L80E is much stronger than the 4L60E, and the 4T65E is stronger than the 4T60E. There were 4T60E-HD'* available up through 97 I believe, for the supercharged applications. This was before GM had switched over to the 4T65E in the H body.

Here'* an excerpt from an article I found online -- the whole text is at http://www.findarticles.com/p/articl...06/ai_20862013
"The anticipated boost in GM'* use of the powder alloy steel sprockets is due to its unpublicized plans to put the 4T65E transmissions in more and more of its five- and six-passenger cars and minivans. Right now, many of those front-wheel-drive vehicles are equipped with GM'* 4T60E automatics, which will be phased out--or nearly phased out--by 2000-2001, GM sources say as they are older, less powerful, and less efficient than the 4T65Es. ... Introduced just a couple of years ago, the higher-torque 4T65Es use the powder metal sprockets in place of conventional induction hardened malleable cast iron units to transmit power from the engine to the transmission via two silent chains supplied by Borg-Warner Automotive Inc.'* Morse TEC operating subsidiary in Ithaca, N.Y."

Another article here http://www.designnews.com/article/CA151178.html reads

"AGGRESSION. General Motors' new 4T65E transmission, an upgrade of the popular 4T60E, features a gearbox designed to withstand the increased torque and power capacity for GM'* supercharged 3800 engines."

I think the number is more of a model designation.

That'* what I was thinking.