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Old Feb 10, 2008 | 11:37 PM
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two questions

Why does my diesel have two batteries and what weight gear oil goes in a transfer case. I have the 2000 crew cab f-250 psd. (you know, the one that has reverse slipping but all the forward gears are perfect) I am way new to a diesel truck.
 
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Old Feb 10, 2008 | 11:42 PM
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the compression on diesels is much higher then a gas engine, and it takes alot more cranking power to start it. You need every bit of those two batteries or it's not gonna start period! Someone else will chime in on the weight of gear oil....it's a bit chilly to go poking around in my garage right now lol
 
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Old Feb 10, 2008 | 11:45 PM
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^^^^^^^^^ like he said, more compression. Plus the batteries have to power the glow plugs at the same time.

Also, transfer case doesn't take gear oil. It uses ATF. Here's some instructions on how to change it: http://guzzle.rbmicro.com/transfer.html
 
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Old Feb 10, 2008 | 11:55 PM
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you guys are a world of help. noticed that was for an 02. is that the same transfer case. also noticed one of you are from co. I wanna go out west someday bad and hunt. that is my dream. it was you pocket.
 
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Old Feb 11, 2008 | 12:11 AM
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That's what the site is all about......asking questions, getting answers! Welcome to FTE
 
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Old Feb 11, 2008 | 12:12 AM
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Yep, it's the same x-fer case.
 
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Old Feb 11, 2008 | 12:15 AM
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thanks guys, now would that be dexron or atf.????????? lol
 
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Old Feb 11, 2008 | 12:42 AM
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It's more of an electrical thing rather than 'an engine compression' thing.

My ol' Vette has a compression ratio of 13.5:1 and only one little red top.
 
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Old Feb 11, 2008 | 12:59 AM
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Originally Posted by SolidGround
It's more of an electrical thing rather than 'an engine compression' thing.
It is both. Energizing the GPs and fuel pump will knock your average batt in the dirt, and if the system cannot support that along with cranking the engine and maintaining 10.5 volts, it probably will not start. That is why there are two batteries.
 
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Old Feb 11, 2008 | 01:32 AM
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Has anyone around here done a dual alt. setup if so who?
 
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Old Feb 11, 2008 | 08:19 AM
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Originally Posted by 4inchlovin
Has anyone around here done a dual alt. setup if so who?
I'm not certain, but I think the stock alternator puts out about 100 amps. So the dual setup would give you about 200 amps output. I'd just switch out the stock alternator for a 200 amp high output alternator, rather than go through all the hoops of installing a dual alternator setup. Oh, and the two alternators in the dual alternator setup are different alternators...they are not identical.
 
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Old Feb 11, 2008 | 08:24 AM
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It would be much cheaper installing a higher output alternator then doing a dual setup. It can be done on our trucks, the ambulance package has it. I'm pretty sure you would have to change your pulley system to do it, but I've never researched it.
 
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Old Feb 11, 2008 | 09:04 AM
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My wife's Excursion has dual alternators, factory.

An 'improvement' for our trucks is to run the upper radiator hose for a dual-alternator set-up, therefore running the hose around the serpentine belt instead of through it. Makes belt changes a snap.
 
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Old Feb 11, 2008 | 10:05 AM
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Originally Posted by 12 pointer
thanks guys, now would that be dexron or atf.????????? lol
It should be at least Mercon rated. Mercon is just hard to find most days. You can use Mercon V or full synthetic as well. I would get Mobil1 while I was at it. I just changed out my power steering (which is also ATF) and it made a huge difference in the effort it takes to turn the wheel and it quieted down the pump quite a bit as well. If it works that well in the PS pump, I can only imagine that it will be very good in the transfer case as too.
 
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Old Feb 11, 2008 | 10:08 AM
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Originally Posted by HKusp
It should be at least Mercon rated. Mercon is just hard to find most days. You can use Mercon V or full synthetic as well. I would get Mobil1 while I was at it. I just changed out my power steering (which is also ATF) and it made a huge difference in the effort it takes to turn the wheel and it quieted down the pump quite a bit as well. If it works that well in the PS pump, I can only imagine that it will be very good in the transfer case as too.
which did you use???????????
 
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