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Gearing question...it's been a while #839705
10/04/07 03:57 AM
10/04/07 03:57 AM
jcssurf  Offline OP
Mudrunner
Joined: May 2002
Posts: 354
charlottesville/blacksburg
Hello all,

I haven't been here in a over a year...graduating, job, marriage, moving, and little time for offroading have contributed to that. But I'll be around occasionally. The 90 is staying a farm/chore/hauling truck and my new offoad toy is a Jeep TJ (fingers crossed).

My question:

The 90 currently has 4.56's and 32's on it (22RE, 5 speed). I think I'm going to swap the 225/75's from my Jeep with the 32's and bring the 90 back to stock size. This will make my parents happy, since they thought it was the loudest thing they have ever ridden in.

My question is, how bad will the engine scream with 4.56's and 28" tires? Or on the contrary, will power be awesome while also being manageable on the highway? It is only driven on the highway maybe once a month, otherwise just country roads and dirt paths. But sometimes it's on the highway for an hour or more at a time.

When I get a chance, I'll probably swap the 4.10's back in and sell the 4.56's, since the Toyota will never be a DD. I guess I just wanted some opinions. I think the 4.56/28" combo is very similar to 5.29/33".

Thanks!


90 pickup, 22RE, stiff-ass Ranchos, 2.25 catback, 4:1 header, conical intake, 15x7 ICW alloys, 32x11.50 Dunlop Mud Rovers, 4.56s w/v6 rear

-Farm truck until school is done...then plans

2000 Honda CRV EX 5 speed

-Driver

From the Off-Road World
Re: Gearing question...it's been a while [Re: jcssurf] #839706
10/04/07 04:58 AM
10/04/07 04:58 AM
Snowtoy  Offline
Roll Me Over
Joined: Apr 2002
Posts: 3,567
Grass Valley, CA
Around the farm it wouldn't be bad running tires 3 sizes smaller than what it is geared, though you will be giving up ground clearance and contact patch for traction when going to the smaller tire. On the highway you will be screaming, probably in the mid 5k's at 55 mph.

If you want to see how it will work swap out the tires and take it for a spin, you will have all the first hand info you need.

I would just sell the tires from the TJ and put a set of used 31 MT's on the Toy, and leave the 4.56's in it. Besides you never know when you might need the Toy as a trail truck, or if the TJ doesn't work out for you as a trail rig.


More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed
Re: Gearing question...it's been a while [Re: Snowtoy] #839707
10/04/07 01:07 PM
10/04/07 01:07 PM
jcssurf  Offline OP
Mudrunner
Joined: May 2002
Posts: 354
charlottesville/blacksburg
I was thinking about the cheap 31's for the 90 route, but I'm trying to be super cheap. And I still have the 4.10's I can swap.

5000 rpm at 55??? It runs like 3300 at 75 now, with a tire that's 10% smaller, I should only be at 3600 or so at 75. And a bit less at 65 or so.


90 pickup, 22RE, stiff-ass Ranchos, 2.25 catback, 4:1 header, conical intake, 15x7 ICW alloys, 32x11.50 Dunlop Mud Rovers, 4.56s w/v6 rear

-Farm truck until school is done...then plans

2000 Honda CRV EX 5 speed

-Driver

Re: Gearing question...it's been a while [Re: jcssurf] #839708
10/04/07 02:59 PM
10/04/07 02:59 PM
4Crawler  Offline
Web Wheeler
Joined: Jan 2000
Posts: 12,153
N. California. USA *****
You would be turning a little over 3000 @ 65 w/ 4.56 gears and 28" tires and 3500 @ 75:
- http://www.4crawler.com/4x4/4LoCalc.shtml#FindRPM

Re: Gearing question...it's been a while [Re: 4Crawler] #839709
10/04/07 04:22 PM
10/04/07 04:22 PM
jcssurf  Offline OP
Mudrunner
Joined: May 2002
Posts: 354
charlottesville/blacksburg
Thanks, Roger.

This makes me think that I would be alright. With the new clutch, it will probably smoke'em in 1st!

One last thing: I think the 1990 uses a speedo gear. Where can I get one to recalibrate if I like the setup? How many teeth would I want?


90 pickup, 22RE, stiff-ass Ranchos, 2.25 catback, 4:1 header, conical intake, 15x7 ICW alloys, 32x11.50 Dunlop Mud Rovers, 4.56s w/v6 rear

-Farm truck until school is done...then plans

2000 Honda CRV EX 5 speed

-Driver


Moderated by  4Crawler, kewlynx 

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