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5:38 gears........

Discussion in 'The Garage' started by hi pinion, Feb 20, 2005.

  1. hi pinion

    hi pinion 3/4 ton status

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    Any one running 538 gears in there blazer? If so , how are they? Are they streetable? :)
     
  2. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Not with 35's in my opinion. 5.13's are plenty low and 5.38's would seem like it would kill top end and definantly fuel mileage. But....I have never had either ratio.
     
  3. beater_k20

    beater_k20 Banned

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    2500 @ 70 really isnt that bad.
     
  4. hi pinion

    hi pinion 3/4 ton status

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    I was kind of looking for someone with some real world , hands on kind of experiance,someone who is running these. :grin:
     
  5. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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    If someone had the need for gears like that, chances are they'd be running one ton axles...and 5.38's aren't officially out for a 14 bolt yet.
     
  6. beater_k20

    beater_k20 Banned

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    the 5.38s are already in the Sterling rear, which from what i hear is a very stout piece, offered in the rear of Ford trucks. the only thing that would cause me to shy away from the deal is the fact that its welded, and he's driving it on the street.
     
  7. SUBFAN

    SUBFAN 1/2 ton status

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    5.38's is what I want to end up with....Of course I think it would be fine....
     
  8. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    What size tire? Overdrive?

    For the record, there was a rumor on Pirate last fall about someone coming out with a 5.38 for the 14 bolt (Yukon maybe?). Don't know if it's true, just something I read.
     
  9. ntsqd

    ntsqd 1/2 ton status

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    I run 5.38's in my 'glas buggy. Trans has a mild OD and with 31's it's only 3k for 60 MPH.
     
  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    It's not a rumor, they'll be out VERY soon.

    I was going to run 5.38s in mine but I'm getting a doubler instead.
     
  11. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    IIRC he will have 35's and does have a TH700R4.
     
  12. BAJA_BLAZER

    BAJA_BLAZER 1/2 ton status Author

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  13. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    No no, run the 5.38's AND a Doubler. :pimp: :cool1:
     
  14. Silver84k5

    Silver84k5 1/2 ton status

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    How would the pinion on the 5.38 compare to that of a 5.13?
     
  15. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    I haven't seen any posts reguarding the tooth counts for the r&p. would think they're fairly similar, probably 1 tooth less on the pinion if that. :dunno:
     
  16. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Honestly, I don't feel that would be a good combo with a 4 speed. Low-low would be too low, low-high would not be low enough, and for mud, I'd be stuck running in high-high and being too high or low-high and being too low.

    I think the 4.10s will be ideal with a doubler. It allows me to keep the ratios I have now, and have the super low of the doubler for the hard stuff.

    I have resisted re-gearing because I wasn't sure if I would want a doubler, and because of my 10 spline 465 I didn't have a whole lot of options. I have been talking to Northwest Fab about this idea since even before his doublers were released, and I feel that for the $$ expended, the doubler is my best option.

    If I ever had R&P failure or whatever, I can fix it with nice used stock parts, too, another plus.
     
  17. dirtwarrior17

    dirtwarrior17 Banned

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    seems like a k5 won't be able to get to 240 mph at 6000 rpm. :grin:

    At first that seems right with the whole 5.38 gears and 35's being at 2500 for 70 mph but since the chart goes on to tell you that with 3.73 gears, a k5 hits 140 mph at 3500:haha: :screwy: , I start thinking the real world speeds would be a lot less for a lot more rpm.

    Anybody have 5.13's or 4.88's with a 700R4 and 35's that they have been out on the highway with? what is the speed for rpm?
     
  18. beater_k20

    beater_k20 Banned

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    i've got a gear ratio/speed calculator that i've been using for years, i got it from Team Chevelle. its has been very accurate. of course these calculations are assuming perfect conditions, with no converter slip in OD at 65mph, and a true 35" tire. i'd give it 200-300 rpms more, and it shoudl be dead nuts.

    4.10s - 1800 rpm
    4.56s - 2000 rpm
    4.88 - 2150 rpm
    5.13 - 2250 rpm
    5.38 - 2350 rpm
    6.72 (rockwells) - 2950 rpm
    7.17 - 3150 rpm
     
  19. dirtwarrior17

    dirtwarrior17 Banned

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    those rpms are for 65?
     
  20. beater_k20

    beater_k20 Banned

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    clearly stated that in the post didnt i? :confused:
     

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