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Old 08-02-2013, 11:31 AM   #1 (permalink)
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Installed a tachometer learned something new

I finely installed my ISSPRO tachometer on my diesel suburban using a magnetic pickup pulling a signal off the flexplate.
So I know its accurate.

After I looked up how many teeth the 6.2L diesel flex plate has (139) I programmed that into the tachometer.
As soon as I took it out for its first drive I realized I was turning a good number more RPMs than it should have been.
Also knowing how much my speedometer is off helped too (reads about 2 to 3mph slow at 60mph).

I found out that my suburban does not have 3.08 gears and a posi diff, like it should have according to its build sheet.
It appears to have 3.42 gears and an open diff.

Which makes sense for 2 reasons.

1 I have always had a feeling that the rear axle had been swapped.
2 When I bought my suburban it had a 2-5/16'' ball hitch on the back.

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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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Old 08-02-2013, 11:43 AM   #2 (permalink)
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Glad you did a fine job!
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Old 08-02-2013, 02:35 PM   #3 (permalink)
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Very common thing there Chevy and ford had a rash of delinquent rear axles in trucks from 82 -2002. many back yarders are scared to work on the rear gears and just pop one out and bolt whole axle into thiers. my suburban had special axles rated at 3/4 ton level but with 6 lug pattern found 2 separate gear ratios then much to my dismay found front axle was the weaker standard 28 splined replacement.
Regardless both got 4.11, with auburn gear limited slips, and 31 splined moser axles.
It balanced out the 38' tires and stock enging /trans operated at original performane levels again. was very costly!
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Old 08-02-2013, 02:46 PM   #4 (permalink)
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Join Date: Jan 2008
Location: up north
Posts: 12,735

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,571
Thanked 3,508 Times in 2,195 Posts
38 foot tires LORDY!

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