Any mods needed to 8.8 to go from 4.10 > 4.56/4.88 - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-12-2009
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Any mods needed to 8.8 to go from 4.10 > 4.56/4.88

I thought there was a different center pin or something that was needed to swap to a lower ratio. But am not sure. I'd like to run 4.88s on mine, for the fact i just like running lower gears. Engine seems more happy at higher revs on the highway.

Thanks!
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Old 04-12-2009
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You can get a notched cross pin, but I would grind the tips of the 1 or 2 teeth that get in the way on the ring gear. That way you can reuse the stock cross pin and you aren't stuck with a weak notched pin.
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Old 04-12-2009
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Thats a tough trade off between cutting gears or a thinner shaft. I'd like a Richmond or quality center pin would be better than notching the gears. Something to consider...

I want to regear pretty soon. 3.0L + 4.10 + 33 = Too Doggish for me!
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Old 04-12-2009
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Grinding the teeth of the ring gear sacrifices NO strength whatsoever. You have to grind a very tiny bit off the tip of the edge of the teeth at the tall part of the gear. Mine was only 2 teeth and I've seen ppl get away with only grinding a single tooth. I didn't have the option of using a notched pin because of the full carrier e-locker that went in. But personally I wouldn't use a notched pin even if I could.


Here is a good thread Shane started about grinding the teeth on the ring gear.
https://www.ranger-forums.com/forum2...8751&highlight
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Old 04-12-2009
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idk what made my gears so special.

the shop said nothing about having to grind gears, or get a special cross pin, and it didn't look like they did?

i do know one thing.. you dont want that pin breaking.
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Old 04-12-2009
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If you're not grinding the contact area on the teeth no big loss. Lose that crosspin and you're in for some serious damage.
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Old 04-12-2009
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My 4.88's are grinded...I got them from Zabeard already done No pain on my part :) I would grind though...way before notching a center pin, I already had one break in the 7.5
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Old 04-12-2009
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k thanks. jrpro, any idea of cruising rpm/mph with your 4.88s and 35s? looks like ill notch the gears, i just need to find some used 4.88s or the like.

Are there any mods needed for 4.56?
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Old 04-12-2009
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Quote:
Originally Posted by Goodysgotacuda View Post
k thanks. jrpro, any idea of cruising rpm/mph with your 4.88s and 35s? looks like ill notch the gears, i just need to find some used 4.88s or the like.

Are there any mods needed for 4.56?
I beleive Griggs (John) had to notch teeth for 4.56
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Old 04-12-2009
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Originally Posted by Goodysgotacuda View Post
k thanks. jrpro, any idea of cruising rpm/mph with your 4.88s and 35s? looks like ill notch the gears, i just need to find some used 4.88s or the like.

Are there any mods needed for 4.56?

YES, IT SUCKS...don't do 4.88's if you drive hwy a lot...at 70 it's almost 3k rpms...

I tow and a drive hwy all the time, and I wish to god I had 4.56, I loved 4.10's and 33's...at the time I hated it and through it was slow, but the RPMS with 4.88's and 35's are way way too high...just feels like it's revving up too much. I don't know why i decided on 4.88 but I want 37's to calm it down! I actually want 5.13's and 38.5's :) soon soon
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Old 04-12-2009
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Thanks, i had a feeling it'd be a bit higher than the rpm calcs say. it was saying 4.88, .75od and 33s would be 2800 at 80mph. which would be perfect for me. i think 4.56 is the best bet. i wont go any bigger than 33
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Old 04-12-2009
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5.13s are a tad over 3k and 4.88s were just under 3k at 70mph with 35s.. i find myself pulling it out of 5th thinking i have a 6th gear sometimes
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Old 04-12-2009
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Before I got my 4.88s my truck didn't have the ***** to use overdrive at highway speeds. I found myself in 4th gear at all times just to hold 70 mph. I wouldn't give up my 4.88s for anything......except maybe 5.13s.
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Old 04-12-2009
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haha, thats 2 for 4.88s is too low for me. I cruise more at 75 and 80 for long rides. 4.56 should be a decent mix. 3k at 80 would be perfect, the 3.0 likes more revs. Last time i went to california i got 18mpg with it at 80-85 because the revs were up and less downshifting up the hills. So i'll take the 4.56!
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Old 04-12-2009
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i love my 4.88s, got all the uumph i need with the 35s. plus i plan on going bigger so 5.13s may be in my future (Yes i know 5.13 dont fit the ifs.)
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Old 04-12-2009
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Quote:
Originally Posted by Goodysgotacuda View Post
haha, thats 2 for 4.88s is too low for me. I cruise more at 75 and 80 for long rides. 4.56 should be a decent mix. 3k at 80 would be perfect, the 3.0 likes more revs. Last time i went to california i got 18mpg with it at 80-85 because the revs were up and less downshifting up the hills. So i'll take the 4.56!
Keep your 4.10's until you get 35's, trust me. If you are driving 80, your rpms will be crazy high...I get horrible MPG above 3krpms. Especially if you tow.
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Old 04-12-2009
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Too many hills out here, plus a little higher elevation depending on which part of town i'm in makes me want to toss the 4.10s. Too many hills in this terrain to bog down the little 3.0L. Much different than Florida! Higher rev's dont bug me so much, i run synthetic and change it out like I should. Shouldn't hurt too much.


Probably wont be much worse rpm wise than when I was stock running 29s and 4.10s...

Last edited by Goodysgotacuda; 04-12-2009 at 11:37 AM.
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Old 04-12-2009
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Originally Posted by Goodysgotacuda View Post
Too many hills out here, plus a little higher elevation depending on which part of town i'm in makes me want to toss the 4.10s. Too many hills in this terrain to bog down the little 3.0L. Much different than Florida! Higher rev's dont bug me so much, i run synthetic and change it out like I should. Shouldn't hurt too much.


Probably wont be much worse rpm wise than when I was stock running 29s and 4.10s...
gotcha, with that said I'd go for it. My 3.0 bogs even when I hit a little tiny hill...even with 4.88's! On a highway onramp I'm downshifting and hunting for gears...it sucks
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