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wanting better gearing 87 d150

Discussion in 'Performance' started by wraith587, Sep 15, 2015.

  1. wraith587

    wraith587 Member

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    This was originally a 225 truck. At some point someone halfhazzdly installed a 318. Lots of small issues to clear up with that. One of them being this small peg leg axle. WP_20150915_003.jpg

    It is has a 3.2 tag. Not bad for a 225. But not nearly enough for my 318. Also have plans to install nv3500 5 speed to compensate and retain if not gain a couple mpg. I found a 3.55 limited slip Durango 9.25 in a salvage yard. Question is will that entire axle assembly fit my truck? Granted I would ha e to swap out axle shafts... Or does any one know of any axles with gearing closer to 4.10 that will swap in? And actually tow.
     
  2. pt006

    pt006 Active Member

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    wraith; it looks like an 8 1/4" rear end. the axles won't swap. The Durango might be a different width [spring perches --- drum to drum]?

    9 1/4" came with 3.90's as an option on some 4 speed autos.
     
  3. valiant67

    valiant67 Rich Corinthian Leather
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    There would have been a wide array of axle options available that will bolt in, probably any of the D series trucks from the 1970s through 1993. No need to try and fit a Durango rear axle.
    Probably not as common as they once were but 3.55 and 3.92 and even 4.10 geared axles should be out there.
     
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  4. wraith587

    wraith587 Member

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    Not to be rude but aren't 8 1/4 difs built like the 9" with removable 3rd member?
     
  5. wraith587

    wraith587 Member

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    Sadly those are quite hard to find. Would a 440 ramcharger truck have said low gears in it?
     
  6. valiant67

    valiant67 Rich Corinthian Leather
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    It depends on how it was built, there were lots of options for gear ratios back then.
     
  7. valiant67

    valiant67 Rich Corinthian Leather
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    You are thinking of the 8 3/4, it has the removable venter section. The 8 1/4 and 9 1/4 don't.
     
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  8. wraith587

    wraith587 Member

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    Duly noted. Actually went to a reputable speed/ race shop near me and was clarifies on such lol. Apparently the Dakotas and Durango uses the 8 1/4 just with a different housing. I know of one that is a 3.9 tag limited slip that is ready for the guts to be yanked. Gonna try and snag that
     
  9. pt006

    pt006 Active Member

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    wraith; I'd recommend going to a 9 1/4". They came with 3.21, 3.55, and 3.90 ratios in 88/89. Ramchargers and pick-ups are the same housings. I believe most pickups from 74? thru 93 should fit. Check Hollanders to be sure.

    The 8 1/4" is a good rear end, but with a low geared tranny and a loaded truck, it is pushing the limit. Changing the ring and pinion in either one requires special tools.
     
  10. dana44

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    Instead of swapping guts around and having the setup cost and all that, grab a tape measure and measure backing plate to backing plate, and perch to perch. Perches can be moved easily enough, brake line connections are usually hassle free, emergency brake hook-up not a major issue most of the time, and U-joint size is 50/50, but in your favor it is the right size.
     
  11. AC TC

    AC TC Well-Known Member

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    Some durangos came with 9 1/4 rears, mine have it. (5.9 4x4)
     
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  12. valiant67

    valiant67 Rich Corinthian Leather
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    So did some Dakotas. Sadly the 9.205" rear axle in the late 1990's and early 2000's was no longer the bullet proof unit it was in years past.
    Many Dakotas and Durango axles will be a no-go because of:
    1) 6 lug wheels
    2) Some were over the spring mounts and some were under the spring mounts.
     
  13. AC TC

    AC TC Well-Known Member

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    The oddball 6 lug pattern is a pain in the butt, the same as viper thou...
     
  14. dana44

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    Wasn't the six bolt pattern only a couple years around 1995? I know mine are 6 lugs.
     
  15. valiant67

    valiant67 Rich Corinthian Leather
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    It started in 1991 (on the Dakota) and lasted through 2004. It was present on all first gen Durangos (1998-2003). Only the 1987-1990 Dakota had the 5x4.5" bolt pattern. Durango never did. Then in 2004 Durango and 2005 Dakota went to a larger bolt pattern, 5x5" maybe.
     

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