trying to figure out what gears I need - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 06-19-2010, 09:53 AM
inquiring_mind2's Avatar
a shade tree mechanic
 
Last photo:
Join Date: Jul 2004
Location: Illinois
Age: 43
Posts: 477
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
trying to figure out what gears I need

I have a 75 cj5 I use in mudd bogg competitions. I have a 427 bored 60 over. I am using dana 44 front and rear ends out of a 78 J10 truck. I have a turbo 350 with a reverse manual valve body and I am using the dana 300 transfer case. I also have 35 in boggers on it. my question is what gears should I put in it to get the maximum rpm range out of my motor. The cam is good up to 7200. I would like for it to be quicker off the line but I also need enough gear to keep the tires turning bout 6800 rpms because the track is 200 ft long.


Right now I have 410 gears in the front and the rear. in drive I am turning about 6000 rpm's in second gear I am running about 7000. I would like to keep it in drive if at all possible for less wear and tear on the tranny. Any help would be greatly appreciate.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-19-2010, 10:25 AM
sqzbox's Avatar
My pipes are my music
 
Last photo:
Join Date: Sep 2009
Location: indiana
Age: 64
Posts: 2,938
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
4:56's should have you in third before you drop into the pit! Or, put it in 4/W low range.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-19-2010, 12:13 PM
inquiring_mind2's Avatar
a shade tree mechanic
 
Last photo:
Join Date: Jul 2004
Location: Illinois
Age: 43
Posts: 477
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I have it in low range now. I would love to run high range but I tried that and it fell flat on its face
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-19-2010, 01:41 PM
sqzbox's Avatar
My pipes are my music
 
Last photo:
Join Date: Sep 2009
Location: indiana
Age: 64
Posts: 2,938
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
So what your saying is you want something between low and high, right?
4:56's! I think that 5:something would be the same as low range.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-19-2010, 01:54 PM
inquiring_mind2's Avatar
a shade tree mechanic
 
Last photo:
Join Date: Jul 2004
Location: Illinois
Age: 43
Posts: 477
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
yes that is right I would love to go to high range but I don't know what gears would go good with the turbo 350 and the dana 300 transfer case I have or I can stay in the low range and use different gears to get the most out of my motor. I am open for any options right now
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-19-2010, 02:19 PM
Registered User
 
Last photo:
Join Date: Apr 2010
Location: Hawaii
Posts: 373
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
http://www.rockcrawler.com/techrepor...omax/index.asp

From what I read here^^, low-gear in a Dana-300 is 2.62:1? Assuming high gear is 1:1, if you add 2.62 to your 4.10, will give you a final ratio of 6.72...which is what you'll need in the axles to get the same performance you're getting now...but running in high gear. Gears in the 6+ range is pretty high (low). What about changing to a higher stall converter to get your RPM up (was it 7000 you wanted?). That's definitely cheaper.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 06-19-2010, 02:24 PM
inquiring_mind2's Avatar
a shade tree mechanic
 
Last photo:
Join Date: Jul 2004
Location: Illinois
Age: 43
Posts: 477
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I would like to be able to run around the 7000 rpm range. The stall I am using know is small its 3200. I know I need a bigger one but I understand what you are saying. So If I understand correctly I need something in the 6's to make it work correctly in high. Now will running it in high gear get me more wheel speed? with those gears?? I don't know if it would be cheaper to buy the gears or the converter. A good converter will set me back about 600 to 800 dollars.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 06-19-2010, 02:32 PM
Registered User
 
Last photo:
Join Date: Apr 2010
Location: Hawaii
Posts: 373
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Running a 6.72 gear (or something close), in Drive, with T-case in high...will get you pretty much the same performance as as your 4.10, 2nd-gear, with T-case in low. That's a lot of gear though...to get the same performance. Do they even make a gear that size for a Dana 44?
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 06-19-2010, 02:59 PM
inquiring_mind2's Avatar
a shade tree mechanic
 
Last photo:
Join Date: Jul 2004
Location: Illinois
Age: 43
Posts: 477
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I have no clue I would have to do some research on that
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 12-30-2010, 05:13 PM
inquiring_mind2's Avatar
a shade tree mechanic
 
Last photo:
Join Date: Jul 2004
Location: Illinois
Age: 43
Posts: 477
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
ok I have another question to ask?? I was thinking about running high side on the transfer case and running maybe 1st or 2nd gear in the transmission. I also did some checking around the and tallest gear I can get for a Danna 44 is a 589. I didn't know if that would work or not. ALso would any one be willing to tell me how to figure all of this out?? I am always wanting to learn new things that way I can help others out
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 12-31-2010, 09:56 AM
matts37chev's Avatar
I don't understand?
 

Last journal entry: this is only a test
Last photo:
Join Date: Jan 2009
Location: Shelton,Wa.
Age: 45
Posts: 2,420
Wiki Edits: 0

Thanks: 0
Thanked 5 Times in 4 Posts
i would stick with low range in the transfer case
one thing to think about, is using a little higher gear ratio in the front axle
so it will pull you straight
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 12-31-2010, 09:58 AM
matts37chev's Avatar
I don't understand?
 

Last journal entry: this is only a test
Last photo:
Join Date: Jan 2009
Location: Shelton,Wa.
Age: 45
Posts: 2,420
Wiki Edits: 0

Thanks: 0
Thanked 5 Times in 4 Posts
Quote:
Originally Posted by inquiring_mind2
I have a 75 cj5 I use in mudd bogg competitions. I have a 427 bored 60 over. I am using dana 44 front and rear ends out of a 78 J10 truck. I have a turbo 350 with a reverse manual valve body and I am using the dana 300 transfer case. I also have 35 in boggers on it. my question is what gears should I put in it to get the maximum rpm range out of my motor. The cam is good up to 7200. I would like for it to be quicker off the line but I also need enough gear to keep the tires turning bout 6800 rpms because the track is 200 ft long.


Right now I have 410 gears in the front and the rear. in drive I am turning about 6000 rpm's in second gear I am running about 7000. I would like to keep it in drive if at all possible for less wear and tear on the tranny. Any help would be greatly appreciate.
so you are looking to gain 1000 rpm so you can run in drive?
are only using 2nd now?
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 12-31-2010, 11:20 AM
big gear head's Avatar
High Performance Rear Ends
 
Last photo:
Join Date: Nov 2009
Location: Central City, KY
Posts: 2,024
Wiki Edits: 0

Thanks: 10
Thanked 392 Times in 338 Posts
Keep this in mind too. When you go to something like the 5.89 the pinion gear head is getting very small, and much weaker. With the tires you are running you are putting a lot of strain on the drivetrain.

What connecting rods do you have in that 427? Just because your cam is good to 7200 RPMs doesn't mean that the rest of your engine is. I've built a lot of big block Chevy engines and they have very heavy parts in them. The 3/8 rod bolts have a big job trying to keep everything together with those heavy rods and pistons, and the valve springs have some heavy valves to keep under controll. Be carefull when you spin a big block that fast.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 12-31-2010, 11:23 AM
sqzbox's Avatar
My pipes are my music
 
Last photo:
Join Date: Sep 2009
Location: indiana
Age: 64
Posts: 2,938
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by matts37chev
i would stick with low range in the transfer case
one thing to think about, is using a little higher gear ratio in the front axle
so it will pull you straight
Like mine? 4:09's in the front and 4:10's in the rear. I only have 31" M/T's
but in low range, 3rd gear is like first in high range.The secret to full pulls is wheel spin like seeing 70 mph on the speedo all the way through the pit.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 12-31-2010, 11:29 AM
eloc431962's Avatar
Evil Wicked Mean And Nasty
 
Last wiki edit: Pilot bearing and bushings
Last journal entry: roof repair
Last photo:
Join Date: Nov 2008
Location: back in the garage.
Posts: 13,762
Wiki Edits: 37

Thanks: 50
Thanked 28 Times in 24 Posts
Quote:
Originally Posted by big gear head
Keep this in mind too. When you go to something like the 5.89 the pinion gear head is getting very small, and much weaker. With the tires you are running you are putting a lot of strain on the drivetrain.

What connecting rods do you have in that 427? Just because your cam is good to 7200 RPMs doesn't mean that the rest of your engine is. I've built a lot of big block Chevy engines and they have very heavy parts in them. The 3/8 rod bolts have a big job trying to keep everything together with those heavy rods and pistons, and the valve springs have some heavy valves to keep under controll. Be carefull when you spin a big block that fast.
This is some very good advice.


Cole
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
8.5 10 bolt spider gears Hubes Transmission - Rearend 1 07-02-2008 04:38 PM
Changing rear end gears? Cutlass403 Transmission - Rearend 8 10-05-2007 01:11 PM
What speedometer gears do I have? Johnny Bravo Transmission - Rearend 3 04-11-2007 09:19 PM
bbc what gears to run.? chevelle4542speed Engine 5 12-07-2006 05:47 PM
Exploded spider gears...? (12 bolt GM) Bumpstick Transmission - Rearend 7 10-07-2003 06:00 PM


All times are GMT -6. The time now is 04:32 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.