CJ's MJ Posted March 6, 2015 Share Posted March 6, 2015 When I bought my truck it came with 35's on it. Is it normal for the truck to not want to roll with bigger tires? I have to give it some extra gas just to get it rolling. When I let off the accelerator it almost feels like I am lightly applying the brakes. Just want some feedback before I do anything to it. Link to comment Share on other sites More sharing options...
AeroNautical Posted March 6, 2015 Share Posted March 6, 2015 I assume your truck is an automatic, so it has a bit of forward pull when in gear. It could be a number of things, dragging brakes, bad wheel bearings, improper differential gearing. A 35 is a big tire, and alot of mass to move. I wouldn't be too terribly concerned about it once you've checked what I mentioned above and they are good. Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 6, 2015 Author Share Posted March 6, 2015 What is the best way to check the differential gears? Also what is the average fuel milage for the 4.0? The only thing that I have done to date to the truck is pull off the awful looking JK flares that the PO riveted on and replaced all the fluids in it. This is my first jeep and first 4 wheel drive. I have very little knowledge about it right now. One thing I wanted to add is how grateful I am to finding the club. Every one here is willing to help out and that just something I find totally awesome. I wanted to thank everyone for just being a great group of guys. Link to comment Share on other sites More sharing options...
rustybottoms88 Posted March 7, 2015 Share Posted March 7, 2015 I echo your praises of the CC forum. Great group of folks, friendly and willing to help. Anyways PFCLiest pretty well covered it. But the best way to check your gearing, assuming they have not been changed from stock is to find the tag on the diff or check for stamps on the housing. If it likely has after market gears then pull the diff covers and count teeth. Someone else can probably weigh in on fuel mileage as I just now started driving our 4.0l but I would guess 13-17 mpg with alot of factors that can effect that. If your running 35" tires I would say 10mpg if your lucky. Good info here: http://www.jeepforum.com/forum/f9/faq-how-do-i-determine-my-gear-ratio-615380/ Good luck! Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted March 7, 2015 Share Posted March 7, 2015 Jack the truck up as soon as you feel the drag , rotate the tires and check for resistance . If you can turn the tires with ease you should be ok , if not check the brakes , hoses , bearings at whatever wheel (s) you feel they are tight . Link to comment Share on other sites More sharing options...
dunnc1991 Posted March 7, 2015 Share Posted March 7, 2015 What are the specs of your truck? Engine/trans? Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 7, 2015 Author Share Posted March 7, 2015 Thanks guys will be my project for tomorrow. You are pretty accurate with your guess about fuel milage rusty. Mine is averaging just about 10. I was looking at both front and back axles. From the pictures I found on here I believe I have Dana 44's on both. When I check the gearing am I wanting both to be the same? Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 7, 2015 Author Share Posted March 7, 2015 I haven't figured out which Trans I have yet. Motor is in line 6, 4.0 when I bought it I was just awe stuck with it. Honestly I really didn't know the comanche existed until I saw mine. Link to comment Share on other sites More sharing options...
rustybottoms88 Posted March 7, 2015 Share Posted March 7, 2015 You have any pics of your truck? Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 7, 2015 Author Share Posted March 7, 2015 Yes I have some. Finding the club inspired me to take pictures. Lol I haven't tried to post any yet though. Link to comment Share on other sites More sharing options...
dunnc1991 Posted March 7, 2015 Share Posted March 7, 2015 Auto or manual? Also what year? Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 7, 2015 Author Share Posted March 7, 2015 It's a 89 and a standard. I was thinking of replacing wheel bearings. Are they the same for the different axles? Link to comment Share on other sites More sharing options...
dunnc1991 Posted March 7, 2015 Share Posted March 7, 2015 Being an 89, it could either be a Peugeot ba 10/5, or an ax15. Being a 4.0 5 speed, factory gearing would be 3.07. If it still has these, then with 35's your truck will be a dog. A gear swap should definitely be in your future. Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 7, 2015 Author Share Posted March 7, 2015 What gears would be best to go with? I plan on checking what I have later today. Will take better pictures of everything underneath. Hopefully I can get pictures posted later today. Link to comment Share on other sites More sharing options...
Rockfrog Posted March 7, 2015 Share Posted March 7, 2015 4.10 if you do a lot of hi way travelling, 4.56 for more trail/city, 4.88 if purely a trail rig. But I'm not a fan of the weaker pinion mesh (limited pinion gear contact) with 4.88's on a D30. Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 7, 2015 Author Share Posted March 7, 2015 Here is no hi way miles at all. Top speed is 35. Well the speed limit that is lol. Most people including myself hit about 50 for normal driving. I don't do in in the MJ but our other cars yes. Link to comment Share on other sites More sharing options...
rustybottoms88 Posted March 7, 2015 Share Posted March 7, 2015 Take some pics of your axles as well and post up. Postively ID all of your components before buying parts from the parts store. It is possible a PO may have swapped axles. Link to comment Share on other sites More sharing options...
Incommando Posted March 7, 2015 Share Posted March 7, 2015 No way that you have a D44 front unless someone has done some serious swapping. If your front diff cover looks like your rear diff cover I would bet that you have a D30 front/ d35 rear. That is also the most common combo by far. With a D35 in general and for sure with 35's on it the consensus is that spending any money in that axle is throwing money away. A swap to a later XJ 8.25 or Explorer 8.8 would serve you much better for not much more money. Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 7, 2015 Author Share Posted March 7, 2015 I am not positive on what axles I have. I said that it looks like the pictures I saw of the 44. I know very little about jeeps at this point. Trying to learn everything I can about it before I start throwing money into it. Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 7, 2015 Author Share Posted March 7, 2015 Empty Post Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 7, 2015 Author Share Posted March 7, 2015 Hopefully that works for a photo of rear. Using my phone to do this. Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 7, 2015 Author Share Posted March 7, 2015 Empty Post Link to comment Share on other sites More sharing options...
CJ's MJ Posted March 7, 2015 Author Share Posted March 7, 2015 From what I can tell the 44 is what it looks like from the photos of axles I have seen. It looks nothing like a 35. Link to comment Share on other sites More sharing options...
Incommando Posted March 7, 2015 Share Posted March 7, 2015 The rear is a Dana 44. The front is a Dana 30 :thumbsup: Link to comment Share on other sites More sharing options...
dunnc1991 Posted March 7, 2015 Share Posted March 7, 2015 Rear is a Dana 44 Tree'd ^ Link to comment Share on other sites More sharing options...
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