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How to find my diff ratio
Posted: Fri Jul 03, 2009 5:03 pm
by dansharp
Looking to find what ratio my rear diff is. Car only recently bought so have no idea if it is an original diff or not. It is in a 1985 Hilux dual cab diesel. Cheers
Posted: Fri Jul 03, 2009 5:11 pm
by Struth
Trans/axle code on the plate under the bonnet.
Last 3 number should be the axle code.
Ring Mr toyota spares and tell em you need one, ask what ratio they are offering to replace it.
cheers
Posted: Fri Jul 03, 2009 5:32 pm
by Tonka tuff 4x4
the only way you can tell is to pull diff centre out.
Posted: Fri Jul 03, 2009 5:47 pm
by dansharp
cheers so diff centre out hey....... dam
Posted: Fri Jul 03, 2009 6:04 pm
by Weiner
Or you just look at this
http://www.rsmotorsport.com.au/technica ... _Hilux.pdf
Or off Pirate4x4
Originally posted by TNToy
----------------------------------------------------
If you have the axle code of your vehicle, it is easy to find out what size differential, what ratio, and what pinion set-up you have. This will also help if you are hunting for a particular unit off another vehicle. The axle code is in the vehicle ID plate under the hood or drivers door. The axle code is 4 digits: a letter followed by 3 numbers.
Example: G292 = 8.0" 4.10 final ratio 2 pinion
Code:
1ST R&P SIZE 2nd/3rd R&P RATIO 4th DIGIT PINION SET-UP
F = 7.5" 07 = 3.900 2 = 2 pinion
G = 8.0" 08 = 4.110 3 = 2 pinion LSD
10 = 4.375 4 = 4 pinion
14 = 4.875 5 = 4 pinion LSD
25 = 4.556
28 = 4.300
29 = 4.100
31 = 3.91
38 = 3.42
43 = 3.56
54 = 3.90
66 = 3.07
.
.
Code:
Ratio Ring/Pinion Color Crawl:Ratio
3.42 ...42/12... Purple ...31:1
3.90 ...39/10... Red... ...36:1
4.10 ...41/10... Pink.. ...37:1
4.11 ...37/09... Orange ...37:1
4.30 ...43/10... Blue.. ...39:1
4.37 ...35/08... Green. ...40:1
4.56 ...41/09... Yellow ...41:1
4.88 ...39/08... White. ...44:1
5.29 ...37/07... None.. ...48:1
5.71 ...40/07... None.. ...51:1
Posted: Fri Jul 03, 2009 6:06 pm
by berad
What are the last 3 numbers/letters on the trans/axle plate.
Weiner has given you all the info you need, being a 85 model deisel it will be 4.3 or 4.5
Mine were 4.5s til i went 4.88's, and mine was a 84 diesel dual cab, with 31's standard according to the trans/axle code's.
Posted: Fri Jul 03, 2009 7:08 pm
by Weiner
I am guessing 4.3
Posted: Fri Jul 03, 2009 7:09 pm
by mudmacaca
count the crown wheel teeth then divide by the pinion teeth
Posted: Fri Jul 03, 2009 7:16 pm
by 80's_delirious
mark the pinion flange, and mark the tyre. Have someone rotate the tyre one full turn and watch the pinion and count how many times it turns,
eg 4 1/2 turns + 4.5:1, 4 1/3 turns + 4.3:1 almost 5 turns probably 4.88:1
Posted: Fri Jul 03, 2009 7:18 pm
by RUFF
It will be a 4.56 if its still the stock centre.
You do not have to pull the centre out to check it if your unsure on it ever being changed. Jack one wheel up. Put a mark on the pinion flange. Now turn the wheel one full rotation. While doing this count how many rotations the pinion does. Then multiply it by two. That will give you the ratio.
Posted: Fri Jul 03, 2009 7:19 pm
by RUFF
80's_delirious wrote:mark the pinion flange, and mark the tyre. Have someone rotate the tyre one full turn and watch the pinion and count how many times it turns,
eg 4 1/2 turns + 4.5:1, 4 1/3 turns + 4.3:1 almost 5 turns probably 4.88:1
If you only rotate the tyre once you need to multiply the pinion by 2. Unless the vehicle is fitted with a spool or locker and its locked.
Posted: Fri Jul 03, 2009 9:59 pm
by RED60
RUFF wrote:It will be a 4.56 if its still the stock centre.
You do not have to pull the centre out to check it if your unsure on it ever being changed. Jack one wheel up. Put a mark on the pinion flange. Now turn the wheel one full rotation. While doing this count how many rotations the pinion does. Then multiply it by two. That will give you the ratio.
Finally someone got it right......
Posted: Fri Jul 03, 2009 10:14 pm
by one_waz
can someone tell me, out of all the hilux ratios 4.3 4.5 4.8 etc is the tooth count on the pinion the same and just the ring that is different? or do they both change?
cheers
Posted: Sat Jul 04, 2009 2:15 pm
by Weiner
one_waz wrote:can someone tell me, out of all the hilux ratios 4.3 4.5 4.8 etc is the tooth count on the pinion the same and just the ring that is different? or do they both change?
cheers
Both are different
Posted: Sun Jul 05, 2009 10:45 pm
by one_waz
ok cheers
Posted: Mon Jul 06, 2009 9:37 am
by vk7ybi
RUFF wrote:80's_delirious wrote:mark the pinion flange, and mark the tyre. Have someone rotate the tyre one full turn and watch the pinion and count how many times it turns,
eg 4 1/2 turns + 4.5:1, 4 1/3 turns + 4.3:1 almost 5 turns probably 4.88:1
If you only rotate the tyre once you need to multiply the pinion by 2. Unless the vehicle is fitted with a spool or locker and its locked.
Yes, its more accurate to rotate the tyre twice rather than multiplying the pinion.