4t65e-HD diff in a 60E case

[TurboGTU]

Ok I see what your talking about the sprag. I'll check them out.
So what it looks like, Just counting teeth you'll find out if you need to take the whole trans apat to use the HD parts.

But I'll also see if using the intermidate gears and sungear from your non fine pitch unit will convet over to the HD differential instead of taking the whole trans apart.

[3400-95-Modified]

I think you are incorrect, only some are the new ratio:

http://home.att.net/~subzero350/1996_4T60-E.pdf

http://home.att.net/~subzero350/1996_4T60-E.pdf

vs
http://home.att.net/~subzero350/1998_4T65-E.pdf

Still means you need to use a 96 3.29 setup... or the fine pitch regular cut final drive ring in a 60e case before you can use 65e parts because all of the 65e's you listed are of that nature... BUT yes you are correct, not all 96+ 4t60e's are the proper FD ring... I forgot that they still threw the ocasional 3.33 in there and so on.. I should have known since I've looked at that page like a million times to try to find which body had the gears and diff I wanted to get 3.42 ratio

In a week or so I'll get the time to visit the yard to grab some HD parts if I can find them and let you know what can be done... or what has to be done... BUT it looks like you will need a fine pitch regular cut FD ring regardless of what you grab diff wise from a HD...

Ok I see what your talking about the sprag. I'll check them out.
So what it looks like, Just counting teeth you'll find out if you need to take the whole trans apat to use the HD parts.

But I'll also see if using the intermidate gears and sungear from your non fine pitch unit will convet over to the HD differential instead of taking the whole trans apart.

Me and Jeff at EP talked about this and we found out that all diff's were not created equal in that area, the pin distances for the planataries weren't all the same, I'm not sure if that was just from say a 3.33 to a 3.29, or so on, but he measured one because he was going to just send me the planataries to get it right before and we found out that wasn't going to work... BUT yes I know what your thinking about... you want to use the 3.33 planataries and sun gear in a HD diff... Definitely a good idea if the centerlines of them match up.

[TurboGTU]

I know that the early gears weren't swapable between ratios, thought maybe the holes on the diff on the 3.29 and 3.33 were the same spacing. Oh well.

I'd drop in the 65 hd in but you guys have to worry about the Force motor selinoid. That would be the easiest way then just axles and rewire the harness and bypass the pressure manifold.

[3400-95-Modified]

Early gears you can still swap, you just need to stay in the same gear cut and direction.... IE, 3.33 and 3.06 are interchangeble... 3.29 and 3.05 are and those are the newer ones. The only diff thats locked into years is the 95 fine pitch reverse cut style diffs.... those were the same ratios as the fine pitch ones but different direction of cut, not sure why but I know the 3 years a beretta had a 4t60e they had the three different diffs... the regular pitch regular cut in 94, the fine pitch reverse cut in 95, and then the fine pitch regular cut in 96... Each "version" per say has 3 of its own diff's that can be swapped into the FD ring that leaves you with 9 different possible ratios each year if you swap out the drive driven gears for the 3 different sets that exist on those.

Either way ease of install it may be simpler for me to just put a 65e hd diff in my 60e case, no newer ecm needed or rewiring since my 96 and 97 ecm's that I can use will not run a 65e I would have to repin for a 98 and run new trans wires.

[pontiacjeff]

Jon, seek and ye shall find...

For you to switch to an -HD diff you will need: the output shaft, -HD diff, talishaft housing, and right side innner c.v. pod from a 96-only 4T60E-HD s/c H-body or V-8 Caddy. (Forget the EP LSD for now.) the -65E has an extra roller clutch back there so there is NO OUTPUT SHAFT that will work in the -60 b/c even the non-HD 65 output shaft is longer than the -60 output shaft. Also, the -65E does not use a bearing on the left side.

Here's how the output shafts go, in order of length, shortest to longest and the method of retention in the diff and whether it uses a bearing or not and spline count on the left side output. They are all the same 27 spline on the diff side.

125 (c-clip, no bearing, 27 spline)
440/4T60 (c-clip, short or long bearing in the middle, 27 spline)
4T60E (c-clip, bearing on the left side on some models, 28 spline)
4T60E-HD (c-clip, 28 spline)
4T65E (snap ring, 27 spline)
4T65E-HD (snap ring, 27 spline)

There is only about a c-hair difference in length b/t the 4T60E-HD and the 4T65E, but the other differences make the selection obvious.

More info, but not enough time in the day to write it all down.

[3400-95-Modified]

Thanks for the info Jeff... But I think right now going with your tougher version of the EP may hold me over... Unless of course I break the diff itself... Which I dont see happening right away

And if I really get into a power issue then I'll probably be looking at re-pinning a 98+ ecm and running some extra wires and switching over to a 65E-HD completely.

Thanks for the info though.

[loner666]

And if I really get into a power issue then I'll probably be looking at re-pinning a 98+ ecm and running some extra wires and switching over to a 65E-HD completely.

Thanks for the info though.

Thats what I need to do but since I have better ideas in mind (that you already know) odds are Ill never take on that project