Jump to content

Recommended Posts

Howdy folks,

I'm in need of new rear end gearing in a bad way. Currently running a 6 speed with I think 2.73's. According to the calculators, I can just about hit 70 in 1st gear, over 100 in 2nd and 297mph in 6th, so yeah, just a tiny bit tall lol! 

Not planning on racing, just spirited driving and the occasional abuse of rear tires and still good freeway cruising So I'm looking at an 8.8 from an Explorer and 4.10 gears, trac loc and disc brakes.

Love to get 2nd opinions from people that know more than me about this if this gearing sounds like a good fit and secondly if the Explorer rear end seems like a solid way to go. Trying to do this on a budget so this seems a lot more affordable than building a 9" as I can do all the parts for probably under $500. 

at 2000 RPM that should have me about here for what looks like still decent freeway cruising, although honestly I'll miss that under 2000PM freeway cruising I have now :classic_smile:

image.png.63303f9b49f0c03d39cab0f43739f238.png

Here's 3500 RPM

image.png.bbe118e4c3a335f14dcc557fb049edfb.png

And 5,500 RPM 

image.png.7ee6b9e625fec7b120cecd5827b345ec.png

 

 

Link to post
Share on other sites

Nice to have that 6th gear. In my opinion a cruising speed of 2,000-2,300 rpm is very pleasant, specially if you have the torque. Cruising speed can mean different things to different people. Some may say speed limit, others 10 over, other 90 mph. Whatever is yours try to keep it within that range and you will be good. Now, I don't know if you have a stock engine or one souped up. Mine being a 408 stroker and having 3.5 gears, I can smoke the tires very easily in 1st gear to the point that it is hard to get good launches without spinning. I can only guess that with 4.10 in street tires it will be even harder. Definitely get some type of truetrac type of differential.

  • Like 1

20160929_171923_edit2_small.jpg

 

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump

Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes

Link to post
Share on other sites

The Explorer rear axle has 31 spline axles and is stronger than the 9-inch with 28 spline axles. Most of them also have Traction-Lok. With a transmission with 0.63 ratio the 4.10 gears will work well, gives you the equivalent of a 2.58 final drive ratio.

Plus, they already have disk brakes.

  • Like 1

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

Link to post
Share on other sites

Perfect, thanks. That's really the confirmation I was looking for. Loads of them in some parts of the country. Around here they get gobbled up for use in jeeps so having a hard time finding that combo. I'll keep looking. Thanks

Link to post
Share on other sites

The explorer 8.8s are great. I have beat the snot out of mine for years and it’s still going strong. It is harder to find in 410. Most of them came in 373. Which is what I have. Let me know if you have any questions about the install or just do a search on the forum. It’s been discussed several times. I posted link to a lot of good info on one of the ranger forums also. 

Edited by turtle5353
  • Like 1

Kevin
1971 Mach 1

408C Stroker - C4 w/3,000 stall - 8.8" Rear w/3.73's - Disc brakes all way around.

 

 

Link to post
Share on other sites

I would not do the explorer rear due to C clip axles. Look for Lincoln, Granada, Monarch 9' Disc brakes rear much better option. If you are going 297 you have a new worlds record, lol. I do not think explorer is just a bolt in but the 9" is.

When a man is in the woods and talks and no women are there is he still wrong??:P

David

Link to post
Share on other sites
On 3/27/2021 at 5:58 AM, turtle5353 said:

The explorer 8.8s are great. I have beat the snot out of mine for years and it’s still going strong. It is harder to find in 410. Most of them came in 373. Which is what I have. Let me know if you have any questions about the install or just do a search on the forum. It’s been discussed several times. I posted link to a lot of good info on one of the ranger forums also. 

Thanks. Yeah I'm pretty sold on them and seems like a fairly straight forward install. I'll look up the other links you mentioned. 

On 3/28/2021 at 1:02 PM, Carolina_Mountain_Mustangs said:

I would not do the explorer rear due to C clip axles. Look for Lincoln, Granada, Monarch 9' Disc brakes rear much better option. If you are going 297 you have a new worlds record, lol. I do not think explorer is just a bolt in but the 9" is.

Thanks I like the idea of the bolt in 9", but they are just a lot more money and less plentiful around here anyway so I think the 8.8 should be a big upgrade as it is. And yes, I'm thinking that 297 MPH might be a tiny bit of a stretch for this car. I still haven't had this thing past 90 so I have to think this thing would disintegrate long before that even if I had the power to do it. :classic_smile: 

Link to post
Share on other sites
  • 3 weeks later...
On 3/27/2021 at 5:58 AM, turtle5353 said:

The explorer 8.8s are great. I have beat the snot out of mine for years and it’s still going strong. It is harder to find in 410. Most of them came in 373. Which is what I have. Let me know if you have any questions about the install or just do a search on the forum. It’s been discussed several times. I posted link to a lot of good info on one of the ranger forums also. 

Hey Kevin,

I've tried searching up and down the forums for details on this but having a hard time as I think it doesn't do well with using 8.8 as a search term, so I'll ask here or if you can point me to some threads I'd appreciate it. 

I finally found a 4.10 rear end now and am looking for details on parts needed to complete the job. Any details you have on things like the spring perches, lower leaf spring plate and the axle flange would be a big help.

Thanks

-Will 

Link to post
Share on other sites

Did you get an 8.8 out of an Explorer?

spring perches I bought from summit racing, they are standard universal perches.  I welded them on to match same pinion angle as the stock 8”  

Lower leaf spring plates I made from 1/4” flat steel. I cut the shock mount ears off stock ones and welded them to the flat plate. Drilled holes properly sized for custom u bolts I had made at spring shop locally. 

Driveshaft was made by same shop that made my u bolts. I used stock drive shaft front half and used rear of the Explorer shaft to bolt to rearend. 

  • Like 1

Kevin
1971 Mach 1

408C Stroker - C4 w/3,000 stall - 8.8" Rear w/3.73's - Disc brakes all way around.

 

 

Link to post
Share on other sites

Thanks, that helps a lot.  Yes, it's from a 2000 Explorer. 4.10 gears, trac lock and disc brakes. 

On the perches, I'm thinking of going longer than standard to help with spring wrap. But sounds like the standard ones are working fine for you and you are running a lot more power than I will be so might rethink that. 

I have the stock Explorer U bolts so hopefully those will work for me. Not sure what I'll do on the lower plate just yet, but was thinking of moding the stock lower if possible. I had the driveshaft made for my new trans not that long ago so hoping to make it work with a different flange rather than cutting it again if I can avoid it. 

Thanks again for the feedback. 

Link to post
Share on other sites

The stock lower plates wont work because the size of the axle tube is bigger on the 8.8. That's why I ended up making my own plates and welding the shock mount ears to them.  Also another thing you don't want to forget to do is to weld the axle tubes to the center section with a good stick welded and some 7018 rod. Get a little better penetration than mig welding them, but a mig will work if you have a 220volt and crank her up a bit.  The stock axles tubes on the 8.8 are pressed in and tend to turn under some power. 

  • Like 1

Kevin
1971 Mach 1

408C Stroker - C4 w/3,000 stall - 8.8" Rear w/3.73's - Disc brakes all way around.

 

 

Link to post
Share on other sites

Ah that's right on the lower plate. Someone had told me that it can be modded but now I see what you mean. And thanks for the tip on welding the tube. I've seen people do that with 8.8's in rock crawlers, but didn't know if that was needed for our cars. May as well do it since we'll be welding on it anyway. 

Thanks again. 

Link to post
Share on other sites

No problem. let me know if you have any other questions! 

  • Like 1

Kevin
1971 Mach 1

408C Stroker - C4 w/3,000 stall - 8.8" Rear w/3.73's - Disc brakes all way around.

 

 

Link to post
Share on other sites

OK, next question, what did you do about brake lines? Do you recall what hoses and fittings you needed to make that work on the Mustang?

Link to post
Share on other sites

Actually the factory mustang hard lines worked fine but they were a little long. Used factory mustang rubber line to the rear end then used the factory hard lines and splitter across the rear end.  I was always going to make new hard line across the rear but never got around to it.  

  • Like 1

Kevin
1971 Mach 1

408C Stroker - C4 w/3,000 stall - 8.8" Rear w/3.73's - Disc brakes all way around.

 

 

Link to post
Share on other sites

I do not know about the Explorer 8.8 but in Mustang about 1985 the brake lines went metric, My son broke his in the 84 mustang 5.0 and the one I got out of junk yard was newer model and the old lines would not fit. I am sure if you take calipers to parts house you can get the right fittings.

  • Like 1

When a man is in the woods and talks and no women are there is he still wrong??:P

David

Link to post
Share on other sites
7 hours ago, turtle5353 said:

Actually the factory mustang hard lines worked fine but they were a little long. Used factory mustang rubber line to the rear end then used the factory hard lines and splitter across the rear end.  I was always going to make new hard line across the rear but never got around to it.  

OK perfect. I was thinking I'd have to rework things. Now looking closer I see the original setup is pretty close, so hopefully this will all just go together. 

4 hours ago, Carolina_Mountain_Mustangs said:

I do not know about the Explorer 8.8 but in Mustang about 1985 the brake lines went metric, My son broke his in the 84 mustang 5.0 and the one I got out of junk yard was newer model and the old lines would not fit. I am sure if you take calipers to parts house you can get the right fittings.

Thanks, I'll verify this isn't metric before trying to wrench things together. 

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...