1997 gmc k2500 burban

[yevgenievich]

Late model "severe duty" clutches are smaller in diameter than my OEM "heavy duty" unit.

part number referenced to standard duty. It was not coming on until about 210*F and just felt like it was not coming on until past 2k rpm

 

[OutlawDrifter]

part number referenced to standard duty. It was not coming on until about 210*F and just felt like it was not coming on until past 2k rpm

Just replaced mine and I was surprised, but it definitely roars sooner and longer. Mines the NAPA brand replacement.

 

[yevgenievich]

Used hd fan clutch with modification worked better everywhere except below 1200 or so rpm. But it is old and well used. By next summer will plan to get a new severe duty clutch and modify it the same way.

 

[yevgenievich]

Tune is improved, but still have a number of things to work out. Pulling trailers better.

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[yevgenievich]

Significantly knock down base frequencies on the exhaust.

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[yevgenievich]

Front shocks completely lost upper bushings. Installed new ones as shocks were still good. Been playing with timing map and seem to run better. According to afr gauge it is running a bit richer than desired at wot. Drops almost to 10 afr at 4k rpm. Best launch in 2wd been just 7sec to 60mph. Tried foot braking and tires spin on take off. Might try in 4wd and see if can get better time.

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[OutlawDrifter]

That's moving pretty good for a 3-ton+ beast!

 

[yevgenievich]

Ran a stock 1998 454 4x4 burban for comparison. Same size tires but 4.10 gear, and otherwise stock. 98 actually felt faster(due to faster time before shift) but was 3 seconds slower to 60mph. According to MAF, stock 454 was pulling 250g/s at wot before shift. Burban shows 420g/s at wot before shift. Before intake manifold and exhaust swap, I was getting maf topping out at 350g/s

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[HotWheelsBurban]

Ran a stock 1998 454 4x4 burban for comparison. Same size tires but 4.10 gear, and otherwise stock. 98 actually felt faster(due to faster time before shift) but was 3 seconds slower to 60mph. According to MAF, stock 454 was pulling 250g/s at wot before shift. Burban shows 420g/s at wot before shift. Before intake manifold and exhaust swap, I was getting maf topping out at 350g/s

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I like that picture, 3 400s in the garage and driveway!

 

[yevgenievich]

Tape is holding off water leaks from top of windshield and tops of large side windows. Otherwise a decent runner, even with over 200k on the odo

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