granny gear
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granny gear
I'm building a 77 f-150 4x4 powered by a 460 with a np435. As of now, the axles are geared at 354. I am going to mount 44" tires and I was wondering if the granny gear would get these tires rolling without having to change the differential ratios?
Fleet Owner
Joined: Dec 2009
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From: NorCal
Hmm..... the NP435 has a first gear ratio of 6.69. Your 9-inch rear prolly has 3.50 gears and the D44 has 3.54s. The .04 difference won't make a difference off-road. First gear will get 44s moving.
On-road is another matter. 2nd through 4th gear coupled with 3.50 rear gear driving 44s is gonna make it a dawg.
I say re-gear to at least 4.56... but that means you'll have to get a different D44 cuz there's a casing split at 3.92.
Is this a mall crawler or a rig that will actually be used off-road?
On-road is another matter. 2nd through 4th gear coupled with 3.50 rear gear driving 44s is gonna make it a dawg.
I say re-gear to at least 4.56... but that means you'll have to get a different D44 cuz there's a casing split at 3.92.Is this a mall crawler or a rig that will actually be used off-road?
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This is definately a mall truck because the weekends my little boy and I go fishing so I'm not in to the off-road. I have a 67 F-100 and a 73 F-100 which I have restored in the last 12 years and I just got the 77 last winter, which has a super lift on it, and I have just finished painting the frame and have started on the bed and cab. The truck had 38s when I got it and everything worked out well. I just got the 44s and I thought I might need to re-gear. So what is meant by the casing split at 3.92 on a d44, because even though I,m not into off-road, I think it would be good to have the same gearing (in case I got stuck in the snow or something.)
Last edited by bucephalus; May 6, 2012 at 05:35 AM. Reason: I touched the wrong key
Fleet Owner
Joined: Dec 2009
Posts: 20,678
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From: NorCal
This is definately a mall truck because the weekends my little boy and I go fishing so I'm not in to the off-road. So what is meant by the casing split at 3.92 on a d44, because even though I'm not into off-road, I think it would be good to have the same gearing (in case I got stuck in the snow or something.)
Post Fiend
Joined: Apr 2008
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From: Big Sky Country
3.54's are gonna leave that motor about 1,000 rpm shy of it's powerband, if this is a driver and not an off-road rig you and your truck will be much happier with 4.56's, 4.88's or even 5.13's.
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