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wtw 10-17-2005, 11:37 AM i have a 1995 chevy step van. it has the 6.5 diesel y motor in it with a 4l80e tranny. i need a new transmission and have found a tag on my tranny of 5alp. i have found other transmissions for sale with differant tags[ 5lap, 5luv, 5hhp] i am wondering what is the differance between the transmissions with the differant tags. any help would be helpful thank you 69camarox 10-29-2005, 08:14 PM the step vans and hd trucks have straight cut planetaries in them most others have helical cut planets the rest is the same they will work but the planetaries are not as strong . they are angled to reduce noise in passenger vehicles Mike L. 10-29-2005, 09:53 PM the step vans and hd trucks have straight cut planetaries in them most others have helical cut planets the rest is the same they will work but the planetaries are not as strong . they are angled to reduce noise in passenger vehicles I have found the straught gears fail quicker than the helical ones. I change them over. 69camarox 10-30-2005, 01:34 PM really how have you had them fail ? washers wearing out or gears breaking ? i have had a few really heavy trucks ( should not have had 4l80e's in the first place ) destroy the helical ones when i put them in put straight ones back in and they were ok these ware big hydraulic boom trucks for working on hydro lines Leadfoot 10-30-2005, 10:17 PM really how have you had them fail ? washers wearing out or gears breaking ? i have had a few really heavy trucks ( should not have had 4l80e's in the first place ) destroy the helical ones when i put them in put straight ones back in and they were ok these ware big hydraulic boom trucks for working on hydro lines I have heard the same thing too. Talking with the guys at ATS, the heavy duty 4l80 (ie 4l85) used in motorhomes and such have straight cut gears because they are stronger (although the side effect is more noise). Mike L. 10-30-2005, 11:19 PM I have heard the same thing too. Talking with the guys at ATS, the heavy duty 4l80 (ie 4l85) used in motorhomes and such have straight cut gears because they are stronger (although the side effect is more noise). In theory I totaly agree. In real life I don't. Why are all the straight gear 4l80s and 400s busted when they come into my shop? Why do they not come back after I change them over? Mind you, I have done hundreds of these transmissions and they are all in heavyduty applications from diesel tow trucks that are abused to airport tugs with 10 to 15 baggage cars behind drag racing on the tarmack. | ||