Thread: Allison Auto Specs

For anyone who may be interested, I stubmled across this:
ISUZU TRUCK PARTS WA
They list the 6BD1 and either an AT545 or AT454 (latter could be a type) 4-speed auto.

Some detailled specs for the 545 can be found here:
AT 545 SPECS

SPECIFICATIONS

Cross-Section | Features & Benefits | Typical Applications | SCAAN Specification Assistance
General rating+

Net input power (max)............................235 hp (175 kW)
Input speed range.......................2400 - 4000 rpm (diesel),
3200 - 4400 rpm (gasoline)
Input speed range w/retarder option.....2400 - 3600 rpm (diesel),
3200 - 3600 rpm (gasoline)
Net input torque (max).......................445 lb ft (603 N�m)
Vehicle weight (GVW or GCW)....................Up to 30,000 lbs
(13,608 kg)

Mounting

Engine...SAE 3 automotive flywheel housing with flex plate drive
Vehicle......................One vertical mounting pad each side

Torque converter

Type.........................Single-stage, 3-element, multiphase
Stall torque ratio.........TC 230-2.60; TC 275-1.96; TC 290-1.72

Gearing

Type..........................Constant mesh, spur type planetary
Range Ratios*:
First...................................3.45:1
Second..................................2.25:1
Third...................................1.41:1
Fourth..................................1.00:1
Reverse.................................5.02:1
* Gear ratio does not include torque converter ratio.

Power takeoff provision*

Converter driven (SAE 6-bolt Regular Duty PTO)
Location............................Right side (viewed from rear)
Drive gear ratio............... All ranges--1.00 x turbine speed
Drive gear rating.................200 lb ft (270 N�m) continuous;
250 lb ft (340 N�m) intermittent

Oil system

Oil type..........................Dexron� IIE;, Dexron� III, C 4
Capacity (excluding external circuit)...20 U.S. qts (18.9 liters)
(w/std. oil pan)
Filter............Full flow, replaceable element, remote mounted
Cooler............................................ Remote mounted

(Filter and cooler not furnished on transmission assembly but is supplied
by vehicle manufacturer.)

Size

Length..........................................27 .2 in (692 mm)
Width...........................................19 .8 in (503 mm)
Height............(with standard 5.3" oil pan)..20.4 in (519 mm)
Depth Below Center Line.........................11.2 in (284 mm)
Weight (dry)....................................289 lbs (131 kg)
Weight (dry w/retarder option)..................329 lbs (149 kg)
+NOTE: Vocational ratings may vary by vocation.
*NOTE: The PTO provision is not available on the retarder models.



Transmission Cross-section (go to top)

2354.gif (25084 bytes)
Design Features & Benefits (go to top)
Designed for use with diesel and gasoline engines up to 235 nhp (175 kW). Four forward ranges and one reverse. This transmission model is best suited for school buses, fuel delivery, beverage delivery, general P&D, limited transit coach and light-duty dump truck applications.
Clutches are multidisc design, oil-cooled, hydraulically-operated and self-compensating for normal wear. Spur-type planetary gears are designed for strength, quietness and long life.
Automatic upshifting and downshifting within each drive range. Built-in inhibitors prevent downshifts or shifts into reverse unless vehicle speed is within an acceptable range.
The Allison three-element torque converter provides smooth, shock-free operation. A choice of converters permits matching the AT 545(R) to a wide variety of engines.
Converter-driven power takeoff drive on right side of transmission (as viewed from the rear) is standard on non-retarder models. Design is SAE 6-bolt.
Provisions for neutral start switch, reverse signal switch, SAE regular-duty thread-type speedometer drive, electronic speedometer drive and parking brake.
5.3 inch oil pan is standard. Optional 3.8 inch oil pan is available when ground clearance dictates its use. Optional 3.8 inch oil pan is not available with retarder option.
An optional additional neutral position allows for "park brake" position on the shift selector for application of an OEM-supplied parking brake system.
Optional input retarder with power absorption capacity of 160 hp at 2600 rpm for vehicle downhill speed control. This option requires the 5.3 inch oil pan.

Unfortunately 4th is only 1:1 - so it would be no different from an LT95 on the highway.

EDIT:

This site lists an AT454 as well, fitted to a 4HE1TC
http://www.truckertotrucker.com/listings/69508.cfm

TH700 would take the power and torque but probably not the vibration.

You could get a lockup converter custom built and controlled from a manually operated servo off a return port so you could get the full 1:1.00 ratio as with 4Th being 1:1.00 it still has a ratio drop through the converter so it would effectively be a lower ratio than the the LT95 manual box.

Size might be an issue as well, it's a pretty big box by the sounds of things.

Great information, thanks.

One of the trucks I do work on is an old SBR with a 6BD1t which would be great as an auto, I may suggest it next time he burns the clutch out