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Old 02-15-2012, 08:57 PM   #1
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Shifting/gears (kinda long, need the help tho!)

how's it going everyone?

I have a 97' Jeep Wrangler Ax-15 Manual transmission and my shifting is getting pretty tough. Down shifting isn't smooth but neither is shifting normally. Then when i go to shift into reverse sometimes its extremely difficult (almost two hands!ha), so do i need to replace the fluid or what?

Also when starting up and shifting from 1st to 2nd to 3rd etc. The jeep doesnt GO smooth(not shift) like it maybe vibrates the best i can explain is that it isnt smooth basically. Anything I can fix or what should i explain better?

Last question I promise(!!), it depends sometimes but when I go to start the Jeep it doesnt turn over right away(would you say it stalls?) then it starts. Sometimes it takes longer than others, do i need to replace spark plugs? I should probably check them anyway!

Thanks again for all your help, im just trying to make sure everything is good shape so I don't need to worry about it and can work on other mods!

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Old 02-15-2012, 09:05 PM   #2
Knows a couple things...

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The slow start after it sits a while over overnight indicates a leaky check valve in the fuel pressure regulator or fuel pump. Replacing the fuel pump/fuel pressure regulator will fix that... which requires you drop the gas tank. When either of those to check valves leak, it lets gas that is supposed to stay up next to the fuel injectors for fast starting to instead drain back down to the fuel tank.

Your transmission may be in need of an overhaul, but you can try changing its gear lube since there is no telling if the right stuff is in there. Two gear lubes that are approved by Aisin who made your AX-15 include a synthetic 10W-30 engine oil, or Redline MT-90 which can be purchased for less from Summit Racing

If it grinds shifting into Reverse, understand that Reverse gear is not synchronized. To stop Reverse gear from grinding, simply first momentarily shift into a forward gear like 1st gear, THEN shift into Reverse. That momentary shift into a forward gear first will temporarily synchronize Reverse gear which if done correctly, will stop Reverse from grinding.

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Old 02-15-2012, 09:10 PM   #3
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Quote:
Originally Posted by Jerry Bransford View Post
The slow start after it sits a while over overnight indicates a leaky check valve in the fuel pressure regulator or fuel pump. Replacing the fuel pump/fuel pressure regulator will fix that... which requires you drop the gas tank. When either of those to check valves leak, it lets gas that is supposed to stay up next to the fuel injectors for fast starting to instead drain back down to the fuel tank.

Your transmission may be in need of an overhaul, but you can try changing its gear lube since there is no telling if the right stuff is in there. Two gear lubes that are approved by Aisin who made your AX-15 include a synthetic 10W-30 engine oil, or Redline MT-90 which can be purchased for less from Summit Racing

If it grinds shifting into Reverse, understand that Reverse gear is not synchronized. To stop Reverse gear from grinding, simply first momentarily shift into a forward gear like 1st gear, THEN shift into Reverse. That momentary shift into a forward gear first will temporarily synchronize Reverse gear which if done correctly, will stop Reverse from grinding.
I will definitely replace the fuel pump/fuel regulator then so thanks for the advice.

Overhaul? Not familiar but i'll google it and I dont know whats under so Im going to replace the fluids anyway with Redline MT-90.

I definitely knew the reverse gears weren't sync'd because they do grind but will that work when the Jeep is off then start it and shift into reverse immediately? Basically, ill go to back out of the driveway and shift into reverse and its extremely difficult but it does not grind at all. That's why i'm confused..
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