Speedometer Cable / Jerking Needle

[Action]

3.08 gear ratio in diffs
the speedo gear color matches the number of teeth, so there is only one color for a given number.
I have no clue what the number is. The part number given in the -387-24p manula should be correct. I would look and see if that is in your t/c before you order anything.

 

[cg25713]

Hey Ya'll. Still stumped. I removed and checked the elbow gear adapter and the red gear inside the t-case - yes it is red. All looked perfect. I cleaned, lightly lubricated and reinstalled. At 20 it seems close to accurate but at 30 and 40 its still 5-6 mph fast.

I have one more question for those in the know. The adapter, or part #20 in Figure 421 of TM 9-2320-280-24P-2, has four equally spaced notches in the top to accommodate the half circle clip that holds it down (part #23 in the same diagram). This means the adapter can only be held by the half circle clip at two different positions. I have heard the term "clocked" and I see the gear numbers on the top of the adapter - can someone briefly explain this further?

 

[Action]

If there are 4 notches, then it can be clocked in 4 positions.
dont use -280 manuals for your truck. You want the -387 series.

 

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[cg25713]

U r right. Okay so 4 positions. Where is the indicator mark on NP208?

 

[Action]

U r right. Okay so 4 positions. Where is the indicator mark on NP208?

There is no NP208 in HMMWV that I know of.

 

[cg25713]

I meant 242. Its the same as yours. 06’ M1152A1

 

[Action]

I meant 242. Its the same as yours. 06’ M1152A1
View attachment 834190

My m1152 isn't the same as yours. I have an REV with the NP2225 water cooled transfer case.

Are you able to get your cell phone up there and take a clear pic of the hole and surrounding case?

 

[cg25713]

I've tried but its tough. Even with the adapter out. Thanks for all you're help. I'll try to look for the mark and maybe get some different gears to experiment with.