trans differences - HD vs non
06-24-2011, 09:04 PM
#1
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trans differences - HD vs non
I think I am having trans problems in my 98 park ave (ultra) and have a spare trans outta a 99 park ave ( not ultra ) and am wondering what I will want to swap over and what I might want to swap from the hd to the non hd.
06-27-2011, 08:16 AM
#3
DINOSAURUS BOOSTUS
Expert Gearhead
The differences
Drive and driven gears: HD had 33/37, Non HD had 35/35 (this effects final gear ratio)
Output shaft: HD is about 1/8" or so longer than Non-HD. I've heard of any not swapping this w/o any issues.
Output Sun Gear: This gear is imperative to be matched to the differential. You can count the teeth and determine which differential is in the trans.
Differential: HD is a 3.29 ratio, non-HD are different and smaller in size as well.
Diff cover: HD is larger for the larger diff.
All other parts are the same in the same year/same version of the trans.
Drive and driven gears: HD had 33/37, Non HD had 35/35 (this effects final gear ratio)
Output shaft: HD is about 1/8" or so longer than Non-HD. I've heard of any not swapping this w/o any issues.
Output Sun Gear: This gear is imperative to be matched to the differential. You can count the teeth and determine which differential is in the trans.
Differential: HD is a 3.29 ratio, non-HD are different and smaller in size as well.
Diff cover: HD is larger for the larger diff.
All other parts are the same in the same year/same version of the trans.
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