I'm finally going to gear my T-case lower in the next couple of weeks, and I've been doing some of the research on installing this thing. However, I have a couple of questions for those of you who have done it...

Does the Advance Adapters version require clearancing the T-Case like the Marlin version? I haven't heard any info either way...

I have a press, and air tools too. How long would you set aside for the install if you an a couple of buddies were doing this yourselves? For those of you who've done this, would you do it again?

On clearancing the case for the gear set, what did you use? Marlin uses a mill... but most of us don't have one. Since I've got an air compressor, I'm thinking die grinder or something, but I haven't heard anyone mention what they actually used. :confused:

I *Know* this stuff is out there in some thread, but the only decent tech I've found on this topic is from Brandon's writeup of the install on the RCRC site...

i did mine in a long afternoon. no big deal. use a die grinder to make it fit. its kinda a trial and error method making them fit. pretty straight forward overall

AA has the same size gears as marlin does. no different

Definitly worth it! Here's Brandon's write up. it's one of the best guides i know of. If ya see any places it needs sdits, let B know.

A die grinder will work fine

Brandon's 4.7 gear review (http://www.rivercityrockcrawlers.com/ProductReviews/Marlin4_7_install/review.htm)

Get some Ultragray for sealing it all back up

Some excellent tips on the outputshaft seals from Big Mike

Big Mikes tips (http://64.246.16.91/~admin22/cgi-bin/YaBB.pl?board=prodsup;action=display;num=102064029 8)

I know that it's worth it. I've driven a buddies Yota with 5.71 (I know, I know) gears and a 4.7 crawler gearset.

I've always had crawler gears next on my to-do list, but that really, REALLY makes me want them. It's cool getting into a truck and feel like you're driving a tractor. :D

I'd already seen the writeup brandon did, steve, but thanks for the rest... :D

I installed my AA 4:1 gears in what basically amounted to about 4 hours. Split over 2 days. I went slow and labeled everything and followed the AA instructions (somewhat). I split mine over two days because I didn't have press and I took the gear assembly to a shop guy I know to press off the bearing and put it back on the new gear set. I chose to clearance my case a little with a 4" electric grinder. It worked fine. I also used a grinder on the shift forks.

Back when I had 33's and 4.88's the 4:1 gears were great. Since then the 38 inch tires made that not so great, so I went to dual t-cases. It's good again now. I don't feel I really need slower for the wheeling I do. I'd take slower, but it's WAY down on the list of improvements.

i put i the AA 4 to 1 set. 4 hours sounds a bit like it.
it took me longer to make longer arms for my gear puller and welded a cap on the end of a pipe to pull and press the bearing on the out put shaft.
i only had to grind on the shifter forks. i didn't have to grind the case at all. i used a cut off disk on my die grinder.
i just kept grinding and checking. it took me three times.

the gears rock. i wondered why i didn't put them in sooner.

Originally posted by Lance Morin
I installed my AA 4:1 gears in what basically amounted to about 4 hours. Split over 2 days. I went slow and labeled everything and followed the AA instructions (somewhat). I split mine over two days because I didn't have press and I took the gear assembly to a shop guy I know to press off the bearing and put it back on the new gear set. I chose to clearance my case a little with a 4" electric grinder. It worked fine. I also used a grinder on the shift forks.

Back when I had 33's and 4.88's the 4:1 gears were great. Since then the 38 inch tires made that not so great, so I went to dual t-cases. It's good again now. I don't feel I really need slower for the wheeling I do. I'd take slower, but it's WAY down on the list of improvements. hey lance,i have that t-case in my truck now.it is real smooth and man what a diff.it made,thanks for a great deal:D

Originally posted by TNToy


Does the Advance Adapters version require clearancing the T-Case like the Marlin version? I haven't heard any info either way...

Marlin's bb has this subject in a post.....lil mike says 9 outa 10 cases do not need clearenced for 4.0:1 gears.

Originally posted by 2stroke
AA has the same size gears as marlin does. no different

why would you say this? the 4.0:1's are smaller diamiter so no they are not the same as marlins 4.7:1's which do require clearenceing everytime, and the 4.0:1's don't 9 out of 10 times.

Originally posted by SeaBass44


why would you say this? the 4.0:1's are smaller diamiter so no they are not the same as marlins 4.7:1's which do require clearenceing everytime, and the 4.0:1's don't 9 out of 10 times.

Bass, I think he is comapring apples to apples here, IE, 4.0:1 to 4.0:1, etc, therfore even though they may be made by different gear cutters, they are simular in diameters based on the ratios

It's a piece o' cake. Just pay attention to where the small parts are, FSM's are great, but AA's insructions were very good, also. I didn't even need a press to install my 4:1's. Take your time, it's no problem.

Originally posted by steveh


Bass, I think he is comapring apples to apples here, IE, 4.0:1 to 4.0:1, etc, therfore even though they may be made by different gear cutters, they are simular in diameters based on the ratios

Marlin is going to have some 4.03:1 or something like that, made in Jo-Pan:D and since the subject says 4.7 what's he comparing 4.0:1's for anywho:confused:

I wasn't talking about 4:1 - another priate thread strays from it's course.:p

I was wanting to know, mainly, if I would be covered install-wise if I had a press, and I guess a die grinder (good excuse to buy one, right? :)) to clearance the case for the...

4.7:1 GEARSET :flipoff2:

How good are the instrucitons on this gearset? Not sure yet if I'll get the AA or the Marlin ones... whatever's in stock when I can afford them. I'm not too picky, really. I just want to know:

How good the instrucitons are,
If those are enough tools,
And how long it took you

So those of you who've done this, speak up please.

Originally posted by SeaBass44


why would you say this? the 4.0:1's are smaller diamiter so no they are not the same as marlins 4.7:1's which do require clearenceing everytime, and the 4.0:1's don't 9 out of 10 times.

I think he was talking about the 4.7 gears. AA sells the 4.7 gears and they ARE Marlins gears just being sold by AA now.

The 4.7:1 is the same as the 4.0:1 except for the grinding. I have Marlin's and the instructions were O.K. for R&I, but somewhat vauge on the grinding. You will start by ginding the case. Be sure everything is very clean and dry, metal chips will stick to everyting oily or wet. I used a die grinder and a carbide bit. What i did was spray paint the bottom part of the case, then installed the big gear and rotated it. It left witness marks where it interfered with the case. I then ground those areas and repeated the procedure untill the gear cleared. It can be difficult to see where the gear interferes after the obvious stuff is ground away. The painting simplifies this procedure and can be removed with brake cleaner when you are done. Once the case is clearenced go ahead and assemble it. you will see when you get to the shift forks that the bottom of the one directly above the new gear needs to be clearence ground. remember to pay attention to the roll pin also. I would say it is a good Saturday job including R&I. Be extra carefull with the little balls on the shafts that locate various gears, they have a tendancy to escape. Use alot of Vasaline to hold them in place during assembly.
Have fun,
-zags-

Originally posted by TNToy
I wasn't talking about 4:1 - another priate thread strays from it's course.:p

I was wanting to know, mainly, if I would be covered install-wise if I had a press, and I guess a die grinder (good excuse to buy one, right? :)) to clearance the case for the...

4.7:1 GEARSET :flipoff2:

How good are the instrucitons on this gearset? Not sure yet if I'll get the AA or the Marlin ones... whatever's in stock when I can afford them. I'm not too picky, really. I just want to know:

How good the instrucitons are,
If those are enough tools,
And how long it took you

So those of you who've done this, speak up please.

Marlin has stock now of the OEM made 4.7 gears. I have a set of the old ones AA now sells under their name. I bought them from Marlin. The darn thing pops out of low range even with the gnarly detent spring. There is a 2 degree taper on the factory gears that prevent it popping out. When I get the money I will buy the new ones from Marlin. I did the clearancing myself but cheated as I have a mill. I have read Marlins instructions and they seem to be good. I have not read AA instructions so I can't tell. Marlin said a 4" body grinder would do the trick. When you get the gears measure the big end of the idler and get a wheel just under that size to give you something to work with. It should not take more than a half hour to actually do the grinding. I would try to take off as little as possible though.

Good Luck, Scott

I just put the Marlin 4.7 gears in my box this last weekend. I took the time to clean and label everything and it took 6 hours. I could do it much faster a second time but i did not want to make any mistakes. The write-up by Brandon referred to earlier was AWSOME for this because it shows pictures of just about every step...... There is also a good set of directions from an AA manual (including torque values) my friend brought over. Well worth the time spent!!!:D :beer: :beer:

Thanks for the help guys, I'm going to go ahead and get the kit when the $$$ come along. Anyone wanna loan me their mill?

I think he was talking about the 4.7 gears. AA sells the 4.7 gears and they ARE Marlins gears just being sold by AA now


FYI....

AA 4.70:1 Gears are Marlin's old outdated 'left-over' gears.

Marlin's new 4.70:1 Gears are many many times improved and more reliable/quieter/stronger/smoother/yadda yadda.

See the differences here (http://www.marlincrawler.com/gearsets.html)

Regards,
BigMike

first time into a toyota transfer case, no work shop manual, and no instructions.took me 3 lunch breaks at work....i used a angle diegrinder, with a carbide bit on it, stuck it in, saw it hit, ground some more, check it out again,,,,etc. then put it in the dishwasher to get the metal out of it...wasnt bad at all...although one of my gaskets leaks a little...damn it!:mad:

tntoy, thanks for the post, i was wondering the same things, i am i asked santa clause for the 4.7s for christmas this year, and word on the street is they may come sooner:flipoff2:

Originally posted by stone
tntoy, thanks for the post, i was wondering the same things.
This thread is a wee bit old. I've been running those gears for a year or so now, and torn into two other Toy cases since. Tossing the 4.7s in aint no big thing... I've got more than enough pics to do the mother of all writeups on it (Brandons is nice but quite unfinished) but just haven't gotten around to it.