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4T65E-HD with 3.05 FDR?

A

agrazela

New member
Has anyone ever heard of a 4T65E-HD with a 3.05 final drive ratio?

If so, exactly which model(s) / year(s) was it available on?
 


A lot of models came with the 3.05 ratio and was mainly 3100 and 3400 powered cars, but there were quite a few of them out there and is a long list of IDs
 
My bad, didnt notice the HD tag at the top. I have never seen any HD diff other than the 3.29 ratio nor has any of my suppliers.
 
Nope the 3100 and 3400 cars were mostly a frd of 3.43 and the older 3100 and 3.4's some were 3.73's as an upgrade
 


ou make me laugh All 65-ehds were 2.93 stock i've never heard of or seen a 3.05 rd 65 e hd came stock with a 3.05 fdr
 
My bad, didnt notice the HD tag at the top. I have never seen any HD diff other than the 3.29 ratio nor has any of my suppliers.
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I thought you have never worked on these before?? Also why dont you read my post above, I already re-replied to my original responce saying I have never seen and HD diff other than 3.29 ratio, there is NO such thing as a 2.93 ratio differential in these transmissions
 
Alright, how about this then. Would it be possible to take the sungear and planetaries (if that's what they're called...the four little gears the sungear engages) from a 3.05 non-HD diff, put them in an -HD carrier, and make a 3.05 HD diff?

I would imagine the pinion shafts the planetaries ride on AND the base circle the holes for the pinions are drilled into the carriers would have to be identical between 3.05 non-HD and 3.29 -HD diffs...which I kinda doubt.
 
I have thought of toying with this in the past but generally drive/driven sprocket changes are plenty to offer desired changes. I will have to contact my supplier on this but I know there are different diffs size wise to accomodate the different gears. The 3.05 will have a larger sun gear with more teeth and smaller planet gears while being the same pitch, so a smaller planet gear in place of a larger planet gear is going to need to be moved closer to the outside for proper contact with the ring gear. I dont currently have any 3.05 diff carriers to check out as they just arent too popular but I am going to Eds shop this weekend and will try to get a trans that has that diff and check it out early next week and post up some pics
 


Cool, I would appreciate that. Maybe a good closeup side-by-side photo of the 3.05 vs. an -HD at the end the OP shaft goes into.
 
Trannyman95 said:
I thought you have never worked on these before?? Also why dont you read my post above, I already re-replied to my original responce saying I have never seen and HD diff other than 3.29 ratio, there is NO such thing as a 2.93 ratio differential in these transmissions
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Just want to make sure I understand, the Hd diff is 3.29, but the hd transmision is 2.93 final drive cause of the chain? Sorry if I sound like a noob but myself and others may be confused by this, cause everyone says 3.29 FD for the non-hd and 2.93 FD for the hd trans
 
That is correct, the 3.29 is the final drive / differential ratio. The 2.93 is the Overall ratio between the sprocket ratio and the diff ratio. An HD transmission has a 37 tooth drive / 37 tooth driven sprocket combo which gives you a 1.121 overdrive from the sprocket ratio. 3.29/1.121 = 2.93 which is your overall ratio. The non HD transmission with the 3.29 diff have a 35 drive / 35 driven sprocket setup which is a 1.00 ratio and gives you the true 3.29 overall ratio.
 
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