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PostPosted: Wed Oct 17, 2018 5:31 pm 
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Certified Bonneville Nut
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Joined: Tue May 04, 2010 11:21 pm
Posts: 3953
Location: Lone Star State
Year and Trim: 2017 Hyundai Santa Fe Sport
Just wondering. We purchased a 1992 Bonneville SSE N/A new for the wife, November 1991. We put 305,000 miles on the car with the original engine and transmission, never anything but maintenance. We stopped driving it because it would not pass emissions. I purchased a 1 owner 2005 Bonneville SE with 58,000 miles on it in 2013(?). The car seamed to be properly maintained. At 112,000 miles the transmission failed.

I think the 4T60E is a better transmission.

What is your take on the 4T60E vs the 4T65E transmission.

Thanks for the input up front. - BC

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In Memory of Brad - 1/21/1977 .. 10/23/2013 ...... Aaron - 1977 .. 2017 .....
2017 Hyundai Santa Fe Sport ..... 1992 Bonneville SSE 1SB 170 HP L27 4T60E retired/sold to MattStrike ..... 2005 Bonneville SE 1SC 205 HP L36 4T65E - retired/salvage yard ..... 2013 Cadillac CTS 1SD 270 HP LF1 6L50 - SOLD ..... PBCF user 2321


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PostPosted: Thu Oct 18, 2018 12:01 pm 
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Joined: Tue Aug 25, 2009 8:32 pm
Posts: 4423
Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
My take is that GM made a good transmission bad by bean counting it down. The 4t65e is inherently stronger than a 4t60e; but lack of auxiliary cooler, cheap seals without enough lip, poor PCS design/placement, and non-hardened parts where they are needed all contribute to early failures of these units. All of this is correctable with aftermarket parts (upgrades, shift kits, etc.) and it makes for a reliable trans. And of course there are plenty of aftermarket performance parts for the 4t65e.

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Runs:
'93 Pontiac Bonneville SSEi - Twincharged, manual, and lots more! Build thread
'97 Chevy Camaro - 3800 supercharged, T5, T-tops
'05 Cadillac STS - V8, AWD, her DD
'92 Olds Trofeo - Fair weather DD
'84 GMC Sierra Classic - Twin turbo 3800
'97 Buick LeSabre - L67 winter DD
'92 Pontiac Bonneville SSE future project

Doesn't run:
'87 Buick LeSabre T-type - future victim
'67 Buick LeSabre - future victim


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PostPosted: Fri Oct 19, 2018 11:56 am 
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Joined: Mon May 10, 2010 6:11 pm
Posts: 8972
Location: Chicago, IL
Year and Trim: 2003 SLE
The 4T60 seems to have less common issues, and with that handles general neglect or lack of service pretty well and for longer than the 65.

My 2003's trans is still going great at nearly 180k miles. Only gives me the very occasional delayed engagement issue. However, I've been pretty good about taking care of it. It's had its fluid changed a few times, two different shift kits, and I think most importantly the cooler.

Back in the day, I was hardly gentle with it too.

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"Penelope" - 2003 SLE - 180k Miles
"Sydney" - 2000 Honda S2000 - 59k miles
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PostPosted: Sat Oct 20, 2018 8:35 pm 
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Joined: Wed May 21, 2008 11:47 pm
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Location: Philly
Year and Trim: 95 SLE
The 60e has a stronger chain and gears. People used to swap these into the 65s way back when. The vacuum modulator also meant there was one less solenoid to fail. Less 4th clutch hub failures too?

The 65 has a better pump, revs higher without issue, better diff option, and can generally handle more power in stock form. Not to mention GM racing div basically figured out how to make it bullet proof.

It does seem that a 60 behind a S1 will last longer than a 65 behind a S2 but I'm not so sure that's a fair comparo. I feel like most 96 S2 L67 SSEis had premature 60e failures.

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