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TDI Conversions Discussions on converting non TDIs into TDIS. More general items can be answered better in other sections. This is ideal for issues that don't have an overlap and are very special to swaping engines.

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Old September 28th, 2018, 20:10   #76
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Old November 20th, 2018, 18:45   #77
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Default Differential 4:30

1992 Isuzu pickup with 4:20 differential tachometer reading at 2500 RPM's 60 mph. Can it be re-geared or swapped with a differential from a salvage yard with a higher ratio?
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Old November 21st, 2018, 07:47   #78
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Is your pu 2wd?

If so it would be cheaper to buy a junker axle from the scrap yard. I dont know what lug pattern you have(there are adapters)

At the local lkq the non highly sought after rear diffs are less than 200 bucks. I purchased them as little as 50 bucks on Craigslist.

Your small truck probably has the similar rear axle width of a ford ranger,s10, jeep xj/yj/tj, explorer, rodeo, blazer etc. Id try to find isuzu options first so you dont need drive shaft mods. Regearing sucks, preload, spacers, dial gauges for proper clearances, plus gears are not cheap! Not sure if you've done it before.

If isuzu doesn't have direct fit proper geared axles that bolt right up cutting off your spring/strut perches and welding them back on a new axle will be easy. I do it with a portable 110 Lincoln flux core. I measure, tack, install, re measure and then weld if it's right.

Getting the correct pinion angle is as simple as owning/borrowing a magnetic angle finder. The trick is finding it before removing the oem axle. Take 2 measurements, 1 with the vehicle weight and again with it all the way in the air. Before you weld it up double check both.

Mount her up, take measurements of the drive shaft then take your drive shaft to the nearest shop to have a proper flange welded on and ballanced.

Ive swapped many axles on my sisters old yj before finally paying for proper axles to hold her 33 inch tires. Those small danas were not meant for off road use and are cheap on Craigslist. The only dana 30/35s that hold any value are the 4cyl 4:10s. The others which would work fine for you can be purchased at scrap prices.

Use a 4x4 gear calculator (google it) to put in your tire size and transmission gear ratios and play with what gear ratio (3:73,3:55 etc) that gets you to your sweet spot. 80 mph at 2900 rpms would be ideal for me! Yours may vary.

Just keep in mind some if these vehicles have disk rear axles, if you go from drums to disks or disks to drums you'll nees to change your prop valve and possibly residual valve too(10 lbs for drums and max of 2psi on disks, many times none are used on disks) adjustable prop valve is nice for dialing her in. Front brakes lock up before rear.


My 79 transam had 2:41 gears to cruise 90 mph with a th350. It would max out the 130mph speedometer and not be turning 5000 rpms.
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Old November 22nd, 2018, 01:33   #79
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PickleRick,
Thanks for the info...It's a 2 wheel drive. I have never re-geared a rear end. Any videos on how to complete the modification? Probably going to difficult finding the an Isuzu diff with gear ratio needed for this model Isuzu: 1992 Isuzu pup LS extended cab. Originally had 2.6l engine. I've seen several Isuzu rodeos in the local junk yard but from what I've read, they will not fit without modification. You make is sound easy. Once I determine what ratio I need, I will give it a shot. May start this weekend. Currently giving it a new paint job.
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Old November 22nd, 2018, 04:37   #80
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A quick google search revealed a good bit of info on isuzu pup axle swap, especially among the 4x4 guys. The Isuzu pup, amigo and trooper all used very underrated and strong axles however i dont think they made a sub 4.10 gear ratio axle.

There are many YouTube videos on refearing a gm 10 bolt axle. I did my 79 transam back in the 90s, went from 2.41 to 3.73. Back then i didnt have the internet. It wasnt super difficult. I had my father help me. With todays YouTube videos it would have been easier. You still need special tools that you cannot rent from advanced that i know of.

You'd be looking at 2 to 300 for the ring and pinion and another 50 to 175 for a spacer/shim or shim/bearing kit

Id avoid the cheap china knock off ring amd pinions, stick with name brands or something with a well known reputation.

Your axle is probably around 56 to 58 inches from side to side so a donor camaro/firebird may also fit your need.

I don't know your size tires or your final drive ratio in your transmission so i don't know what rario to recommend.

If you have drum rear axles and stick with a replacement from wheel axle youll have no other mods to make to the system asside from adapting the brake hoses/lines.

An axle swap isn't difficult. Going from ifs to straight axle is, so is going from 2wd to 4wd. Compared to the wiring job on your diesel swap fabing up a replacement axle is a walk in the park.
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Old November 22nd, 2018, 05:59   #81
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I'm sorry. I meant any videos on replacing the Isuzu 4:30 differential with a different axle that needs some modifications. I don't want to re-gear if I can avoid that. If I can get an idea of what I need, I am going to salvage yard tomorrow.

The transmission is from a Chevrolet S10 V6 4.3L GM NV3500 NV 3500 Transmission 5 Speed
Tires are 15 inch. 6 lug
Thanks for your help!
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Old November 22nd, 2018, 12:41   #82
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What is your tire size? A 15 inch rim can fit anything from a low pro to a 37+ inch tire.


About any leaf spring rear axle swap is similar. Most important part is the axle flange angle

Probably a hundred on yj axle swaps.
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Old November 22nd, 2018, 18:36   #83
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235/60r15
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Old November 22nd, 2018, 18:54   #84
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Are you 100% its a 4:20? I have never heard of that, a 4:10, 4:56.

Your 5th gear is .73, 26 inch diameter tires. Even at 75mph the year calculators estimate 2900 rpms. Assuming its a 4:20. I believe they had a 4:30.
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Old November 22nd, 2018, 19:07   #85
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That was a typo. I can't locate any markings that verify but from what I researched on the Isuzu forum, it is a 4:30.
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Old November 22nd, 2018, 19:46   #86
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4:30 sounds better.

What the max speed you travel? 4:10 i don't think would be a big enough change, maybe a couple hundred rpm difference. 3.73 would. Get you a bigger drop without killing your speed off the line. A 3:55 would be for someone to drives 80 to 90 mph very frequently and doesn't mind losing low end performance. The bhw is preppy but not until 1900 rpms

4:10 is a gear ratio that came on I think v6 2wd pups and maybe amigos. If you could fit larger, maybe 30 inch diameter tires it would be the easiest swap. You'd need to verify this as Its just what i read on a pirare4x4 forum.
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Old November 22nd, 2018, 19:55   #87
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75 MPH would be the max. What is largest diameter tire I could fit on these 15 inch rims? I am going to try and find a 4:10 and up the size of tires. I have plenty of room for a larger diameter fffffffffI think some of the chevy blazers run the 3.73

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Old November 23rd, 2018, 03:40   #88
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That depends on your clearance in the fender wells

Id start with a set of used 10 dollar tires. Try for 30 inch tires first. I think 295 in metric. If they rub you're out 20 bucks. Im not good with metric to sae tire diameter conversions
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Old November 23rd, 2018, 04:46   #89
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How difficult would it be to install a 3.73 S-10 differential. There seems to be a lot of these. When I go to the salvage yard what are the most important things I need to measure?
https://www.ebay.com/i/131889059987?chn=ps

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Old November 23rd, 2018, 07:41   #90
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Measure Wms to wms. Thats wheel mounting surface. You want them to be @ the same. Adapting the brake hoses is not difficult just need to buy or rent a flair tool kit and buy a tube cutter.

Try to grab the drive shaft from the donor as well. If the universal joint is in good shape you can use it and the flange. You're runnung an s10 tranny so you may just need to lengthen or shorten the s10 drive shaft if you find one out of a nv3500 s10. It's a slip yolk i believe so it may fit without mods if you find one similar to your truck (short bed/ regular cab or extended cab/long bed etc combo) just make sure you have some slip yolk exposed at resting height so if you load down the bed with weight you don't run out of travel and force the tranny and rear end together.


An s10 10 bolt would be plenty strong and plentiful. Some even had lsd i believe. Not the hallucinogen.

Your parking brake cable may need to modified. I am a sailor so i have a crimp tool and zinc crimps on hand as well as braided cable if i need it longer, you may need to rent or borrow one, crimps can be purchased at home depot or lowes assuming you have a cable actuating your parking brake.

So long as you are gong from drum to drum or disk to disk brakes no mods should be needed to your master cyl/prop valve.
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